tag:blogger.com,1999:blog-60920395172145033772024-02-12T14:40:57.078-08:00Página do Radioamador CT1BATCT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.comBlogger50125tag:blogger.com,1999:blog-6092039517214503377.post-61564805266926566412023-09-16T09:16:00.000-07:002023-09-16T09:16:01.548-07:00BUG KEY VIBROPLEX<p><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"> <span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Chegou hoje </span></span><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">a mais nova cá de casa</span></span></b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> uma ORIGINAL e, como ela, fecha-se a minha coleção de chaves de Morse.</span></span></span></span></span></span></span></p><p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Nasceu em 1958 ali para os lados de Knoxville no Tennessee-EUA.</span></span></span></span></span></span></span></span></p><p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Serviu um "profissional" durante muitos anos e retirada (só saindo em dias de festa!) e, agora, veio fazer companhia à sua </span></span></span></span></span></span></span></span></span></span></span></span><span style="font-family: georgia; font-size: large;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> irmã mais pequena, a CODE MITE nº. </span><span style="vertical-align: inherit;">552</span></span></span><span style="font-family: georgia; font-size: large;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">!</span></span></span></p><p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Depois de um belo banho (toda desmontada) aqui está ela com ares de nova!</span></span></span></span></span></span></span></span></span></span></span></span></p><p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"></span></span></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjlBvWbs9Gb_CGtOv9LfGlTiK1VioPgfynZ8ioCP8TJOpTyg-AT_kmXp3abn3H5j6ylusrCy5N4-_ikZqd3kXd5dKZDflBbMlXyaHo7Gr3VOsiX6c2RPu6qOfOabyNIoW7fDdqsCjqjjADrSKZvlaatnFA13rVVMl8zVP4mX2I0J9TTYMkW1x4N-8U_0T0" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="1502" data-original-width="2048" height="470" src="https://blogger.googleusercontent.com/img/a/AVvXsEjlBvWbs9Gb_CGtOv9LfGlTiK1VioPgfynZ8ioCP8TJOpTyg-AT_kmXp3abn3H5j6ylusrCy5N4-_ikZqd3kXd5dKZDflBbMlXyaHo7Gr3VOsiX6c2RPu6qOfOabyNIoW7fDdqsCjqjjADrSKZvlaatnFA13rVVMl8zVP4mX2I0J9TTYMkW1x4N-8U_0T0=w640-h470" width="640" /></a></span></span></span></div><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><br /><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Agora vou dar umas voltas com ela para treinar que, para "conduzir" uma Bug destas não chega saber o código Morse!</span></span></span></span></span></span></span></span><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-47894857183992430842023-09-08T05:58:00.007-07:002023-09-08T06:52:06.271-07:00 Construir um BALUN 4:1 <p><span style="font-size: medium;"> <span>Construir um BALUN (que funcione!) não é difícil, nem caro.</span></span></p><p><span style="font-size: medium;"><span>Este exemplo, é de um transformador de 4:1 para aplicar numa Loop de Quadro para emitir </span><span>nas bandas de 10 a 160M</span><span>, sem necessidade de sintonizador de antena/antenna tuner (aqui não se usa 😆).</span></span></p><p><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhBSL40tm-s-1TxkRvFs9qzWYXeevVC_2TWWepdVlFJi1894mwwNqjovSX_MX63LrWX9xqICTa86qSQv9IOqw-XNm8iqvhsM6rAkTqhe0M-f21WJ_BGKUAbmkhTtMJuDXSPdBGQb4D_JODyUhh9Ds7i-WIyrtkAxRVgzjNWtRwmjOnfbOdGVgQtQ5Di6SY" style="margin-left: 1em; margin-right: 1em; text-align: center;"><span style="font-size: medium;"><img alt="" data-original-height="949" data-original-width="1080" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEhBSL40tm-s-1TxkRvFs9qzWYXeevVC_2TWWepdVlFJi1894mwwNqjovSX_MX63LrWX9xqICTa86qSQv9IOqw-XNm8iqvhsM6rAkTqhe0M-f21WJ_BGKUAbmkhTtMJuDXSPdBGQb4D_JODyUhh9Ds7i-WIyrtkAxRVgzjNWtRwmjOnfbOdGVgQtQ5Di6SY" width="273" /></span></a></p><p></p><p><span style="font-size: medium;">Vejam o vídeo (sem cortes😄).</span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-size: medium;"><iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='447' height='371' src='https://www.blogger.com/video.g?token=AD6v5dzPeSSweO4Sg86cVKUFm1JOps_vxYI8bYgMY3l5J1uKI--fa1IITynKqXjEm6KKDsTmp3NhGkthbCteINHjZA' class='b-hbp-video b-uploaded' frameborder='0'></iframe></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">Material e custo: </span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- 2 toróides 140-43 (2x2,52€);</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- 1 PL de chassis (1,49€);</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- 3M de fio esmaltado (3,00€);</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- 1 lata metálica (por ex. de grão de bico😲);</span><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhb6PLaSkKznqZ24lJ7Ut6CvledCgD6nKHTUvtjfIlVaObikHQF7cQFiar6GJvuwRAhfH9PohY27ZRiP2PMcwXTaterCLIvl04mUfFl9CZYmWOFgj6qMTBCBiKn1z39nI9_dC9Vbf_3v55U94fMBid_OlSWJb9o5LV2h6PrUV4n39mDsJYjlMkLWX-P1g4" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img alt="" data-original-height="2008" data-original-width="1688" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEhb6PLaSkKznqZ24lJ7Ut6CvledCgD6nKHTUvtjfIlVaObikHQF7cQFiar6GJvuwRAhfH9PohY27ZRiP2PMcwXTaterCLIvl04mUfFl9CZYmWOFgj6qMTBCBiKn1z39nI9_dC9Vbf_3v55U94fMBid_OlSWJb9o5LV2h6PrUV4n39mDsJYjlMkLWX-P1g4" width="202" /></a></div></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- 25cm de cabo 2mm 2 condutores;</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">- Habilidade qb.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">Custo total: 10,00€, umas horas de gozo e algumas minis!</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;">Quem não tiver minis, pode comprar o balun no mercado (+80€, bem mais apresentável, para colocar lá em cima onde ninguém o vê ao pormenor e, algumas vezes, um bela sucata!).</span></div><div class="separator" style="clear: both; text-align: center;"><span style="color: #b45f06; font-size: medium;">Brevemente, inscrições abertas na TRGM, para uma sessão da Tertúlia do Ferro de Soldar, </span></div><div class="separator" style="clear: both; text-align: center;"><span style="color: #b45f06; font-size: medium; text-align: left;">no ESPAÇO-TERTÚLIA onde, cada um, construirá o seu! </span><span style="color: #ffa400; font-size: medium; text-align: left;"> </span></div><div><span style="font-size: medium;">De acordo com os dados do fabricante (Amidom, Far Rite) suporta 1KW. Qualquer curto, como é sabido, pum! Não culpem o Balun...</span></div><div><i><span style="font-family: helvetica;"><span>(Nota: </span><span>Ajudo em tudo o que precisar mas, </span><span>não peça, que não construo para venda!)</span></span><span style="color: #ffa400;"><span style="font-family: helvetica;"> </span><span> </span></span></i><span style="color: #ffa400; font-size: large;"> |</span></div>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-51736054494267125652023-04-18T10:19:00.003-07:002023-04-18T10:41:53.855-07:00DIA do RADIOAMADOR<p><span style="font-family: georgia; font-size: medium;"><i><b>Aos meus amigos radioamadores, no nosso dia, desejo as maiores
felicidades pessoais e muitos contatos e sucesso nesta atividade fantástica que
é o Radioamadorismo!</b></i></span></p><p class="MsoNormal"><span style="font-family: georgia; font-size: medium;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Aqui fica a minha “prenda” para os colegas radioamadores<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p><span style="font-family: georgia; font-size: medium;"> </span></o:p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia; font-size: medium;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEj6Ls4Eke3j5CL9UwvDw0_D7AoVnjlqLvT9Jvj0ECk-_zByw5tpNJUPEzugNp3ou2m1-TntRuVb7lR7hm0Fejy9tzw06HY4icARBHk7UqGfnHKXHglY9v5Ghi8_4cyvy_2FI-0rHPbWidlt_gZPK2tYUzUu-o2H24BUhQ01-QxUUMvKSDEvKwP4BuOQ" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="3000" data-original-width="3000" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEj6Ls4Eke3j5CL9UwvDw0_D7AoVnjlqLvT9Jvj0ECk-_zByw5tpNJUPEzugNp3ou2m1-TntRuVb7lR7hm0Fejy9tzw06HY4icARBHk7UqGfnHKXHglY9v5Ghi8_4cyvy_2FI-0rHPbWidlt_gZPK2tYUzUu-o2H24BUhQ01-QxUUMvKSDEvKwP4BuOQ=w640-h640" width="640" /></a></span></div><span style="font-family: georgia; font-size: medium;"><br /></span><p></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Uma antena portátil (62cm de diâmetro) construida com 3,90M
de tubo de cobre, 1 condensador variável de 350pF (o que havia à mão, dado pelo
saudoso amigo CT1IJ, porém recomendo 500pF), 1 condensador de 150pF para a sintonia
fina e um bloco de madeira pesada (p.ex. sucupira) para o suporte de mesa (para levar para o monte deve usar uma caixa).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Funciona com eficiência (com ROE abaixo de 1.5 nas bandas de
80M, 40M, 15M, 17M e 20M) sem sintonizador de antena/antenna Tuner que, como
sabem, <u>aqui não se usa</u>!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Claro que os resultados não são os de uma antena de meia-onda (-10dB) mas, como podem ver, serve bem! Veja o vídeo</span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia; font-size: medium;"><a href="https://drive.google.com/file/d/1hjqzv0ovMr3lKR22t-UA-K_m1x5sO0SW/view?usp=sharing" style="margin-left: 1em; margin-right: 1em;" target="_blank"><img alt="" data-original-height="422" data-original-width="305" height="320" src="https://blogger.googleusercontent.com/img/a/AVvXsEhhb2WVxEpf3atv7d-tXglKjvkfgSkYooqcb39OCoF6gp1nvIY5vY9PqyeZ1WJ8dodgfceQD9TlitRKDnVk_OpdoUVgu2sYTDC7L0W0jWHwWP_ntwiYCSmMcDd-0iDrSH5knkLmk1lGipL2uz_F2vcEQyPq0dg9PLEljXd2uWmzkBaD08nepG1VJP8z=w231-h320" width="231" /></a></span></div><span style="font-family: georgia; font-size: medium;"><br /><a href="https://drive.google.com/file/d/1hjqzv0ovMr3lKR22t-UA-K_m1x5sO0SW/view?usp=sharing" target="_blank">https://drive.google.com/file/d/1hjqzv0ovMr3lKR22t-UA-K_m1x5sO0SW/view?usp=sharing</a></span><p></p><p class="MsoNormal"><o:p><span style="font-family: georgia; font-size: medium;"> Vantagens: custa pouco (fazendo), </span></o:p><span style="font-size: medium;"><span style="font-family: georgia;">pesa pouco e mete-se na mala do carro ou carrega-se às costas monte acima!</span><span style="font-family: georgia;"> </span></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Dependendo dos condensadores pode suportar 50W contudo, <u>dada
a natureza da antena recomendo não ir além dos 10W</u> devido à carga gerada (a
um radioamador não será preciso dizer que NUNCA se coloca a mão numa antena em
carga).<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span style="font-family: georgia; font-size: medium;">Esta antena, cujo custo não vai
além de umas poucas dezenas de euros (custo dos condensadores e de 4M de tubo
de cobre) é fácil de construir, porém está no mercado, com a designação de MLA-M (Magnetic Loop
Antenna-Multiband) por 600/700€! <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span style="font-size: medium;"><span style="font-family: georgia;">Mãos à obra e divirtam-se! </span><span style="font-family: georgia;">Feliz
dia do Radioamador</span><span style="font-family: georgia;">!</span></span><o:p></o:p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-68348523672088484362023-04-01T07:25:00.001-07:002023-04-01T10:14:40.578-07:00WSPR<p> <a href="https://blogger.googleusercontent.com/img/a/AVvXsEgglOVTVNrrGkRLPsumolvEh6xW3fp4draDTPuR1QGZt__pza0AUw6GzeHEPaqQ1AOEqztAMPc8Yh4CiFHzMoaF9UkJJvAP4Ied0fFOuo44-mtOu0AL_DtaU4Nyhk7lTk3RAShRF1rlSwYsrXsQHqQg2uQ_TJdePVo6r9dnPSKE2QDN9PqpdWQWTYgZ" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img alt="" data-original-height="694" data-original-width="694" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEgglOVTVNrrGkRLPsumolvEh6xW3fp4draDTPuR1QGZt__pza0AUw6GzeHEPaqQ1AOEqztAMPc8Yh4CiFHzMoaF9UkJJvAP4Ied0fFOuo44-mtOu0AL_DtaU4Nyhk7lTk3RAShRF1rlSwYsrXsQHqQg2uQ_TJdePVo6r9dnPSKE2QDN9PqpdWQWTYgZ=w640-h640" width="640" /></a></p><div class="separator" style="clear: both; text-align: center;"><br /><br /></div><br /><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-53267008242303797532023-03-27T10:23:00.000-07:002023-03-27T10:23:41.398-07:00WSPR: info sobre 160M a partir de IN50<p><span style="font-family: georgia; font-size: medium;"> Informa-se a quem interesse conhecer as <b>condições de
propagação</b> que a baliza <b>WSPR</b> “<b>CT1BAT</b>” inicou hoje a disponibilizar informação, também na banda de 160M situando-se, às 16:19 UTC, na posição 1 de <b>Top Beacon by <u>distance</u></b>.</span></p><p class="MsoNormal"><span style="font-family: georgia; font-size: medium;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">A informação sobre propagação é pública, está disponível
365x24 e pode ser acedida em <a href="https://wspr.hb9vqq.ch/">https://wspr.hb9vqq.ch/</a>
, <a href="http://wspr.aprsinfo.com/">http://wspr.aprsinfo.com/</a> entre
outros.</span><o:p></o:p></p><p class="MsoNormal"><span style="font-family: georgia;"></span></p><div class="separator" style="clear: both; font-size: large; text-align: center;"><span style="font-family: georgia;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgdmRszt-8bHE8oY846Gs_8thwxw37IkBgrJtY53RdAJQj82O-1N4hkNvie0lwSWVOok_BV5WLtDhvm7yrasLGC8j6uLpVqzisSciTmTQ-92Y5kcqEnTEMWMqe12C0Y5CF6-zPwjWrot462SHjQPTwMgAcVBJ-F-Ga7TODe6yI_5akkXw9_LxEit0o7" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="536" data-original-width="1338" height="256" src="https://blogger.googleusercontent.com/img/a/AVvXsEgdmRszt-8bHE8oY846Gs_8thwxw37IkBgrJtY53RdAJQj82O-1N4hkNvie0lwSWVOok_BV5WLtDhvm7yrasLGC8j6uLpVqzisSciTmTQ-92Y5kcqEnTEMWMqe12C0Y5CF6-zPwjWrot462SHjQPTwMgAcVBJ-F-Ga7TODe6yI_5akkXw9_LxEit0o7=w640-h256" width="640" /></a></span></div><span style="font-family: georgia;"><br />Nota: O Beacon WSPR CT1BAT emite a partir de IN50 (cidade de Coimbra), com 100mW (20dBm) através de uma antena EFHW 40M+Bobine para 80M+UnUn 64:1 home made.</span><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-42421630281666721212023-03-08T09:36:00.001-08:002023-03-08T09:41:36.913-08:00Antenas e bobines<div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"> Há uns meses atrás...</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><b>CONVERSANDO SOBRE UNUN</b>s<b> e BALUN</b>s em<b> </b><a href="https://ct1bat.blogspot.com/2022/09/conversando-sobre-ununs-e-baluns.html,">https://ct1bat.blogspot.com/2022/09/conversando-sobre-ununs-e-baluns.html,</a> mostrei a medição, em laboratório, de um <b>UnUn</b> com uma relação de 64:1, medido com uma carga de 3K3 valor central/médio que uma antena de fio irradiante (EFHW) cortada a meia-onda elétrica de um comprimento de onda de 40M, terá no ponto de alimentação.</span></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgli5GhBgSxzeb00XZ67LfJvclYFcvge3oaAXPEhkXDpuCrtiUVFZOnigJQkglXMfNx3xmQJSmOhnb-5jDc1hRow-TkepdXw0oJcNlOvMREVu6JorZxA89Shc2Zs531EGWWyuZDpKxLy8cwYNKANztFbOxsbz3jwWrNz23u9B9_9g5nqeczP6N318GI" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img alt="" data-original-height="320" data-original-width="232" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEgli5GhBgSxzeb00XZ67LfJvclYFcvge3oaAXPEhkXDpuCrtiUVFZOnigJQkglXMfNx3xmQJSmOhnb-5jDc1hRow-TkepdXw0oJcNlOvMREVu6JorZxA89Shc2Zs531EGWWyuZDpKxLy8cwYNKANztFbOxsbz3jwWrNz23u9B9_9g5nqeczP6N318GI" width="174" /></a></div><span style="font-family: georgia; font-size: medium;"><br />Construido o UNUn, ajustamos o adaptador de impedância para o centro (3.300 Ohm) teríamos, nos extremos uma impedância afastada do valor desejado de 50 Ohm. Tal desajuste, para cima ou para baixo atinge um ponto de incapacidade da antena de irradiar o sinal, recebido do emissor e provocaria um retorno (ROE) elevado.</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: large;">Sabemos que, teóricamente, um fio ressonante, alimentado no extremo terá, no ponto de alimentação, um valor entre 2.500 a 4.500 Ohm, dependendo das condições de instalação.</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /><b>Então, o que fazer?</b></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><b><br /></b>- ou se trabalha com 2 antenas (uma para as bandas mais baixas, p.ex. 40 e 80M e outra para os 10, 15 e 20M) em que os valores de impedância são aceitáveis /suportáveis ou, </span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">- com uma só antena inserir, no UnUn, um sistema de comutação para maior e menor impedância, para as bandas mais altas e mais baixas ou </span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">- "induzimos" um comprimento adicional de fio/antena, selecionado pela frequência usada, para a(s) banda(s) mais baixa(s)!</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br />Foi a minha experiência de ontem, a saber:<br />Estava com dificuldades em "faturar" nos 80M com o meu beacon WSPR. (e no ranking dos spots por distância <i><b>o Alessandro melhorou a sua antena e está, de novo, à frente</b></i>, LOL).</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Então, decidi aumentar a minha antena End Fed Meia Onda (EFHW) sem que o aumento do irradiante comprometa as bandas mais altas. Isso faz-se com a inserção de uma bobina/carga indutora que complementada com um pequeno comprimento de fio permitirá a ressonância na frequência desenhada.</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Usei, como habitual, o <b>Coil32</b> para calcular a bobina</span></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEj357mFZP41buK9vKAolWh4Ij6IecQCSrntnB8GRdSiGnrrYJBZrBfU2OEJrLGu9Y3LJKZFdLXtw-gpJN7PE09dzMiKqTCUZbW5LqAok7XAMKi47HGSEgya1uxFvxglq9KO3a_9JLsQTYwWXnrz614k8xd8IrTyPtgKNTzT8u9P0_fsp4nVIrMypNNF" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="font-family: georgia; font-size: medium;"><img alt="" data-original-height="488" data-original-width="652" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEj357mFZP41buK9vKAolWh4Ij6IecQCSrntnB8GRdSiGnrrYJBZrBfU2OEJrLGu9Y3LJKZFdLXtw-gpJN7PE09dzMiKqTCUZbW5LqAok7XAMKi47HGSEgya1uxFvxglq9KO3a_9JLsQTYwWXnrz614k8xd8IrTyPtgKNTzT8u9P0_fsp4nVIrMypNNF" width="320" /></span></a></div><span style="font-family: georgia; font-size: medium;"><br /><br /><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjYj4UpLwNZei4FJrl1V3NJ8s6Yh08oll-5R27idqQPru31qIXfjUivLZVnWzhqP0veOaMD1Sz7H5NL12oEXCwUxWe7wmJHiHUbW4ox0FbkDKb7p0c30s1cfB4d8zwgpsKnT8TGepZb6d8EIiR1GuUgWDStfm8rZ8TCx2-Ts6B--xRrzv958F894_aG" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="font-family: georgia; font-size: medium;"><img alt="" data-original-height="596" data-original-width="416" height="269" src="https://blogger.googleusercontent.com/img/a/AVvXsEjYj4UpLwNZei4FJrl1V3NJ8s6Yh08oll-5R27idqQPru31qIXfjUivLZVnWzhqP0veOaMD1Sz7H5NL12oEXCwUxWe7wmJHiHUbW4ox0FbkDKb7p0c30s1cfB4d8zwgpsKnT8TGepZb6d8EIiR1GuUgWDStfm8rZ8TCx2-Ts6B--xRrzv958F894_aG=w188-h269" width="188" /></span></a></div><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Com os valores, "mãos-à-obra"</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">É fácil, já outros tiveram o trabalho de estudar e construir o programa... não precisamos "chover no molhado"</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"></span><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgm3eFUxrdK_FwcTfCfJhhVaJK2WIz5f_Z_fArBE2uWNfAoKd_QO65WoMDiYn9ro4jskwj0ZbXLmnSABn7M998LmUvlBN4_U6EOh3XinG3YFJex1plO5Q62YE0WsAyehNByGWyf_7xVJqflaQaNql7dbXt3uy3IompTwTARCb4rb0S1o2Bt9H-9F8o7" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="font-family: georgia; font-size: medium;"><img alt="" data-original-height="509" data-original-width="183" height="400" src="https://blogger.googleusercontent.com/img/a/AVvXsEgm3eFUxrdK_FwcTfCfJhhVaJK2WIz5f_Z_fArBE2uWNfAoKd_QO65WoMDiYn9ro4jskwj0ZbXLmnSABn7M998LmUvlBN4_U6EOh3XinG3YFJex1plO5Q62YE0WsAyehNByGWyf_7xVJqflaQaNql7dbXt3uy3IompTwTARCb4rb0S1o2Bt9H-9F8o7=w143-h400" width="143" /></span></a></div><span style="font-family: georgia; font-size: medium;"><br /><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Material:</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">16cm de tubo PVC de 40mm de diâmetro;</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">13m de fio esmaltado de 1,25;</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">furar a 2cm do extremo e enrolar+enrolar+... ao fim de 102 voltas, furar e amarrar;</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">numa extremidade amarrar 1 pedaço de fio (usei 0,75 para potência baixa) com 2,30m (serve para ajuste, encurtando até o desejado e dobrado junto ao fio);</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: large;">desta forma simples (com pouco mais de comprimento) é possível pôr a antena a irradiar nos 80M, onde estava a Zero!</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgjx4uovK6IDy-Vxcf4yY0Mtaj0FdHuWTe1wIVYFVcseDuNOmKZYXTHRbDfVtTKMvYpdQJ4lSdox-TU4tViXv6nACLD1CbsiyqfXdvxBE8GZOtQ2Hc08WCUXpsNA0JiXwwjewStzbjU2lDhWggq3tGye8pEUt0V6-xmhgwkz8UZPHuw0NyK5OXdc2am" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="539" data-original-width="2000" height="172" src="https://blogger.googleusercontent.com/img/a/AVvXsEgjx4uovK6IDy-Vxcf4yY0Mtaj0FdHuWTe1wIVYFVcseDuNOmKZYXTHRbDfVtTKMvYpdQJ4lSdox-TU4tViXv6nACLD1CbsiyqfXdvxBE8GZOtQ2Hc08WCUXpsNA0JiXwwjewStzbjU2lDhWggq3tGye8pEUt0V6-xmhgwkz8UZPHuw0NyK5OXdc2am=w640-h172" width="640" /></a></div><br /></span><span style="font-family: georgia; font-size: large;">Adicionei à antena e o resultado final é este:</span></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEj1p_MsOckm-QjtUBM0bVfcDNQwS5oPd8rvFcsznzmC31fnVClVXWFiVzOnknPcDB3LyBo6MYSXleqSccXa_1gwkAWdlk0stXkUCOZ0zxaZHIYQirQgvVP2Dpa4Ha5QwIhDUNDVY-WQCzl0eHRkUySUMxZP6obdPg5QoD3g9PG13X-pNrVvqx7qOTzr" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="1080" data-original-width="2400" height="288" src="https://blogger.googleusercontent.com/img/a/AVvXsEj1p_MsOckm-QjtUBM0bVfcDNQwS5oPd8rvFcsznzmC31fnVClVXWFiVzOnknPcDB3LyBo6MYSXleqSccXa_1gwkAWdlk0stXkUCOZ0zxaZHIYQirQgvVP2Dpa4Ha5QwIhDUNDVY-WQCzl0eHRkUySUMxZP6obdPg5QoD3g9PG13X-pNrVvqx7qOTzr=w640-h288" width="640" /></a></div><br /><br /><span style="font-family: georgia; font-size: medium;">Hoje, pela manhã, ao fazer a leitura das 24H, o "problema" estava resolvido. A antena tinha feito o seu trabalho!</span></div><div style="text-align: left;"><br /></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEg2kqkuuEI4EFtnK6dcFCf-ridcWVhPUOtK65GVqEYZvxZUdRvzXG2X44nqfdrsFUS8nnSIqu5Gc1uPIV3XEN9HLNITMIaSQdE48UA6ItKoF8Y4-Hdw7YDk2LLKAJwu6rLsPDh4vUE8nqGtApf16hLmVt_ZpM6EEPOdG1jwsLf1PYk7lyGxwOwK_JmX" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="451" data-original-width="1354" height="441" src="https://blogger.googleusercontent.com/img/a/AVvXsEg2kqkuuEI4EFtnK6dcFCf-ridcWVhPUOtK65GVqEYZvxZUdRvzXG2X44nqfdrsFUS8nnSIqu5Gc1uPIV3XEN9HLNITMIaSQdE48UA6ItKoF8Y4-Hdw7YDk2LLKAJwu6rLsPDh4vUE8nqGtApf16hLmVt_ZpM6EEPOdG1jwsLf1PYk7lyGxwOwK_JmX=w1325-h441" width="1325" /></a></div><br /><span style="font-family: georgia; font-size: medium;"><br /></span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Esta noite o Alessandro ficou para trás! (<b><i>ciao</i></b> <b><i>Alessandro, scusa caro!</i></b>)</span></div><p><br /></p><p><span style="font-family: georgia; font-size: medium;">Se consegui passar a MSG, FB. Qualquer dúvida, ao dispor!</span></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com2tag:blogger.com,1999:blog-6092039517214503377.post-86626390902946908242023-02-28T02:20:00.005-08:002023-03-10T14:50:31.320-08:00<p class="MsoNormal"><span style="color: #ff00fe; font-family: georgia; font-size: medium;"></span></p><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhdr-PY45OKBLWz_7FTyMB0ovW4cd7rGQvHL9LdhYRz3WYKQ_Rkpu71AbV1bHr-xUWyv5v3JC4tAjhe9VBjrChTK7bJeDzoYVU50hR1tDd6BcaQSnw1NeJscXBcKcR9yxqK5YkAKvbGElX9pfbR4KAy90DqqtUCfSBJQom3peCm9e-H4SemrQBNJS6d" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="466" data-original-width="1320" height="226" src="https://blogger.googleusercontent.com/img/a/AVvXsEhdr-PY45OKBLWz_7FTyMB0ovW4cd7rGQvHL9LdhYRz3WYKQ_Rkpu71AbV1bHr-xUWyv5v3JC4tAjhe9VBjrChTK7bJeDzoYVU50hR1tDd6BcaQSnw1NeJscXBcKcR9yxqK5YkAKvbGElX9pfbR4KAy90DqqtUCfSBJQom3peCm9e-H4SemrQBNJS6d=w640-h226" width="640" /></a></div><br /><br /></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;">Esta “baliza” figura, nas últimas 24H como a que maior
número de Kms contabilizou entre a sua localização (IN50) e as balizas que a
escutaram e assinalaram, a nível mundial!</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span><span style="font-family: georgia; font-size: medium;">Mas o operador de CT1BAT (descansem os invejosos, lol!) esteve a
dormir, parte do tempo e, outra parte, a fazer coisas mais ou menos
interessantes! A baliza chama-se CT1BAT (que a comprou, instalou e mantém) como
poderia chamar-se XPTO!<br /></span><span style="font-family: georgia; font-size: medium;">Qualquer colega pode comprar uma igual ou, até, construi-la! A diferença está na sua utilização, na ANTENA.</span></div><div style="text-align: left;"><span style="font-family: georgia; font-size: medium;"><br /></span><span style="font-family: georgia; font-size: medium;">O que pretendo dizer é que pode comprar os mais caros equipamentos ou ter as graduações, que lhe aprouver que, se não "trabalhar" a ANTENA
que usa nas comunicações, <span style="mso-spacerun: yes;"> se não </span>“perder tempo” a afiná-la,
orientá-la (e voltar a fazê-lo sempre que necessário), não terá bons resultados! </span><span style="font-size: medium;"><span style="font-family: georgia;">Não há </span><span style="font-family: georgia;">sintonizadores/Antenna Tuner "milagrosos" que, lhes facultem aquilo que a antena física não tem.</span></span></div><p></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: large;">Precisam de afinar as antenas, para terem melhores resultados!</span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: medium;">Façam RADIO e divirtam-se!</span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia; font-size: medium;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjPEi7xS09FEN41WLulAQOqBh68zUao3expmLc6dOnHfE72EfmHYPtRiX3trYDtNujk6tCSQT2NSwiNt3Q9rBTFKGSY9-HVvnP1iISnTW9h1SyryXA4SxbANF6_WZjZuF1FStlBJb4Qouxym36hxCx8mF_8RUbHNbP4uiFSJzVuV_MMsCNy7pakbrSe" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img alt="" data-original-height="1782" data-original-width="1782" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEjPEi7xS09FEN41WLulAQOqBh68zUao3expmLc6dOnHfE72EfmHYPtRiX3trYDtNujk6tCSQT2NSwiNt3Q9rBTFKGSY9-HVvnP1iISnTW9h1SyryXA4SxbANF6_WZjZuF1FStlBJb4Qouxym36hxCx8mF_8RUbHNbP4uiFSJzVuV_MMsCNy7pakbrSe" width="240" /></a></span></div><span style="font-family: georgia; font-size: medium;"><br /></span><o:p></o:p><p></p><p class="MsoNormal"><span style="font-family: georgia; font-size: medium;"><br /></span></p><p class="MsoNormal"><span style="font-family: georgia;">Post Scriptum: antena usada: EFHW, antena ressonante, alimentada no extremo, cortada a 1/2 onda de 40M, instalada em sloper, alimentada por coaxial com adaptador de impedância de 64:1, construidos por CT1BAT.</span></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-56641425456398971022023-02-08T06:47:00.002-08:002023-02-08T06:52:19.749-08:00PROPAGAÇÃO / CICLO SOLAR 25<div class="x9f619 x1n2onr6 x1ja2u2z xeuugli xs83m0k x1xmf6yo x1emribx x1e56ztr x1i64zmx xjl7jj x19h7ccj xu9j1y6 x7ep2pv" style="box-sizing: border-box; flex: 25 1 500px; margin: 8px; max-width: 680px; min-width: 0px; position: relative; z-index: 0;"><div data-pagelet="ProfileTimeline"><div><div class="x1yztbdb x1n2onr6 xh8yej3 x1ja2u2z" style="margin-bottom: 16px; position: relative; width: 500px; z-index: 0;"><div class="x1n2onr6 x1ja2u2z" style="position: relative; z-index: 0;"><div><div><div aria-describedby="jsc_c_5g jsc_c_5h jsc_c_5i jsc_c_5k jsc_c_5j" aria-labelledby="jsc_c_5f" aria-posinset="1" class="x1a2a7pz" role="article" style="outline: none;"><div class="x78zum5 xdt5ytf" style="display: flex; flex-direction: column;"><div class="x9f619 x1n2onr6 x1ja2u2z" style="box-sizing: border-box; position: relative; z-index: 0;"><div class="x78zum5 x1n2onr6 xh8yej3" style="display: flex; position: relative; width: 500px;"><div class="x9f619 x1n2onr6 x1ja2u2z x2bj2ny x1qpq9i9 xdney7k xu5ydu1 xt3gfkd xh8yej3 x6ikm8r x10wlt62 xquyuld" style="border-radius: max(0px, min(8px, ((100vw - 4px) - 100%) * 9999)) / 8px; box-shadow: 0 1px 2px var(--shadow-2); box-sizing: border-box; overflow: hidden; position: relative; width: 500px; z-index: 0;"><div><div><div><div><div><div><div dir="auto"><div class="x1iorvi4 x1pi30zi x1swvt13 x1l90r2v" data-ad-comet-preview="message" data-ad-preview="message" id="jsc_c_5h" style="padding: 4px 16px 16px;"><div class="x78zum5 xdt5ytf xz62fqu x16ldp7u" style="display: flex; flex-direction: column; margin-bottom: -5px; margin-top: -5px;"><div class="xu06os2 x1ok221b" style="margin-bottom: 5px; margin-top: 5px;"><span class="x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u x1yc453h" dir="auto" style="display: block; line-height: 1.3333; max-width: 100%; min-width: 0px; overflow-wrap: break-word; word-break: break-word;"><div class="x11i5rnm xat24cr x1mh8g0r x1vvkbs xtlvy1s x126k92a" style="margin: 0.5em 0px 0px; overflow-wrap: break-word; white-space: pre-wrap;"><div dir="auto"><span style="background-color: #cccccc; font-family: trebuchet; font-size: large;">Estava eu a preparar uma apresentação sobre Propagação e, ao consultar o sitio da NOAA-National Oceanic and Atmospheric Administration deparei-me com a informação, sempre atempada, da evolução do ciclo solar.</span></div><div dir="auto"><span style="background-color: #cccccc; font-family: trebuchet; font-size: large;">Para <span><a style="cursor: pointer;" tabindex="-1"></a></span>meu espanto e satisfação verifiquei que, antecipando o previsto para Julho/2025 foi registado, em 09 de Janeiro passado, um pico de manchas solares (143.6) superior ao registado no máximo do ciclo 24, em Março de 2014.</span></div><div dir="auto"><span style="background-color: #cccccc; font-family: trebuchet; font-size: large;">Não sendo previsível que se vá manter ou não, o facto é que atingimos, antecipadamente, o ponto máximo (até agora) de condições de propagação.</span></div><div dir="auto"><span style="background-color: #cccccc; font-family: trebuchet; font-size: large;">A quem gosta de usar as ondas eletromagnéticas e dar uso às antenas (com o telemóvel também dão, mas não é a mesma coisa...) “bora lá” a dar fogo-à-peça que a coisa está a dar!</span></div></div></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEh3nKebGqqZdy7SQpY_h1yvp2Gz6l6EDyEwbC70KQgg-wZvqmNNbXTBz_ufC5ohiP45Moe6J8sTuHfN6uVC7zvyb1WECivxdLnDDhAQlBMeP1Ry4Zz0n1obw93ZKpbawsYXJpjvVUWTRNptt-qChylRzRe2HLKp8jd2i7lR2af9tvU84ftqfqor5Dsi" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="615" data-original-width="1440" height="274" src="https://blogger.googleusercontent.com/img/a/AVvXsEh3nKebGqqZdy7SQpY_h1yvp2Gz6l6EDyEwbC70KQgg-wZvqmNNbXTBz_ufC5ohiP45Moe6J8sTuHfN6uVC7zvyb1WECivxdLnDDhAQlBMeP1Ry4Zz0n1obw93ZKpbawsYXJpjvVUWTRNptt-qChylRzRe2HLKp8jd2i7lR2af9tvU84ftqfqor5Dsi=w640-h274" width="640" /></a></div><br /><div style="text-align: center;">(clique na imagem para ampliar)</div><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-59488009172884810632023-01-23T03:20:00.005-08:002023-01-23T03:37:58.556-08:00WSPR – nova ferramenta para avaliar propagação <p><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">O Roland–HB9VQQ acaba de lançar mais uma interessante ferramenta que, baseada no WSPR [uíspar]permite saber, ao minuto para onde está aberta e com que intensidade, a reflexiva a partir da sua posição (ou da baliza mais próxima).</span></span></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Na prática:</span></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- procure saber qual a baliza WSPR mais próxima da sua posição (no caso de Coimbra IN50 é a baliza “CT1BAT”**);</span></span><o:p></o:p></span></p>
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</w:wrap></span></v:imagedata></v:shape><span style="background-color: white; font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- aceda a </span></span><a href="https://wspr.hb9vqq.ch/"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">https://wspr.hb9vqq.ch/</span></span></a><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> ;</span></span><o:p></o:p></span></p><p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><u><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- preencha o cabeçalho:</span></span></span></u></span></p><p class="MsoNormal"><span style="background-color: white;"><u><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p><span style="text-decoration-line: none;"> </span></o:p></span></u><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- Modo: </span></span><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Análise</span></span></b></span></span></p><p class="MsoNormal"><span style="font-family: Californian FB, serif;"><span style="background-color: white; font-size: 18.6667px;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- Agregação: </span></span><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Minutos</span></span></b></span></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhS47G51zOx03hyhEY0MN7LptfubzR6kodnF1NsvkK5WeBDdZb3QAE0vbWB88tZjHy42tUdFkRWvvXcPxp0Z7QvwBX5kDgTlc3O1gUcUEBMc2_RuK-fcMlzD5-iNxnTZOeRQC-xqn2BgcfAebLpo47eIOlwRSe5bi3CCICB1Q7sHkJ41Qd3_tskMMXJ" style="margin-left: 1em; margin-right: 1em;"><span style="background-color: white; color: black;"><img alt="" data-original-height="61" data-original-width="1098" height="37" src="https://blogger.googleusercontent.com/img/a/AVvXsEhS47G51zOx03hyhEY0MN7LptfubzR6kodnF1NsvkK5WeBDdZb3QAE0vbWB88tZjHy42tUdFkRWvvXcPxp0Z7QvwBX5kDgTlc3O1gUcUEBMc2_RuK-fcMlzD5-iNxnTZOeRQC-xqn2BgcfAebLpo47eIOlwRSe5bi3CCICB1Q7sHkJ41Qd3_tskMMXJ=w651-h37" width="651" /></span></a></div><p></p>
<p class="MsoNormal"><u><span style="background-color: white; font-family: "Californian FB", "serif"; font-size: 14pt;"></span></u></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgmb7BM7cP6A7QpihjZZ0Eq0JieOauv5T2wo4iCC8sivXpJBHVUKKyWY0fK9v-6CNh3_d4wwml5Por1lGpTc2lwDTY8mETuBi_vnvm5GrO1IgOafQbeCboHa1lujYC7gSF7XJo1KZ3ImIwKuLdsLxjCnrqypvmQwFLwJp1gXBvtSes6CCjdzraDKQOz" style="background-color: white; clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="" data-original-height="507" data-original-width="277" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEgmb7BM7cP6A7QpihjZZ0Eq0JieOauv5T2wo4iCC8sivXpJBHVUKKyWY0fK9v-6CNh3_d4wwml5Por1lGpTc2lwDTY8mETuBi_vnvm5GrO1IgOafQbeCboHa1lujYC7gSF7XJo1KZ3ImIwKuLdsLxjCnrqypvmQwFLwJp1gXBvtSes6CCjdzraDKQOz" width="131" /></a><u></u></div><p class="MsoNormal"><span style="background-color: white; font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p><br /></o:p></span></p><p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><u><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Na barra lateral esquerda:</span></span></span></u></span></p>
<p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Período: 1 hora</span></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Texas: CT1BAT</span></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Banda: Todas ou outra</span></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Confirme com ; </span></span></span><span style="font-family: "Wingdings 2"; font-size: 28pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">P</span></span></span></span></p><p class="MsoListParagraph"><span style="background-color: white; font-family: "Wingdings 2"; font-size: 28pt; line-height: 115%;"><o:p></o:p></span></p><p class="MsoNormal"><span style="background-color: white; font-size: 14pt;"></span></p><div class="separator" style="clear: both; font-family: "Californian FB", "serif"; text-align: center;"><span style="font-size: 14pt; text-align: left;"><o:p> </o:p></span><span style="font-size: 14pt; text-align: left;"><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Aqui tem o resultado: número de spot's por banda, de 2 em 2 minutos, na última hora:</span></span></b></span></div><p class="MsoNormal"><span style="background-color: white; font-size: 14pt;"></span></p><div class="separator" style="clear: both; font-family: "Californian FB", "serif"; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgkkP2v2J7IyfMTUATZnZP1bBcCEb-mKR1Z6RAqEPkawVh7A1Qtr1NGk94TPkezZtGYt2e7_eLNRD9P3t3f-wj1CCZIQRhQqoBRrGvPusosNvewR0oHFTc1POb8VpXNlfeKbKLzKmhcPKpppVdZy7g5ex-vr5NFMlADaSeSvetVekQOvNlzeiUbTxl_" style="margin-left: 1em; margin-right: 1em;"><span style="background-color: white; color: black;"><img alt="" data-original-height="442" data-original-width="1015" height="262" src="https://blogger.googleusercontent.com/img/a/AVvXsEgkkP2v2J7IyfMTUATZnZP1bBcCEb-mKR1Z6RAqEPkawVh7A1Qtr1NGk94TPkezZtGYt2e7_eLNRD9P3t3f-wj1CCZIQRhQqoBRrGvPusosNvewR0oHFTc1POb8VpXNlfeKbKLzKmhcPKpppVdZy7g5ex-vr5NFMlADaSeSvetVekQOvNlzeiUbTxl_=w604-h262" width="604" /></span></a></div><div style="text-align: center;"><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Para ver mais tarde, basta </span></span><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">atualizar</span></span></b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> , ao lado de </span></span></span><span style="font-family: "Wingdings 2"; font-size: 28pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">P</span></span></span><span style="font-size: 28pt;"><span style="font-family: Californian FB, serif;"> </span></span></span></div><p></p><p class="MsoNormal"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"> </span><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Bons DX</span></span></span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: "Californian FB", "serif"; font-size: 14pt;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><i>73 fr José Machado - CT1BAT</i></span></span><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="background-color: white;"><span style="font-family: "Californian FB", "serif"; font-size: 14pt;"><o:p> </o:p></span><span style="font-family: "Californian FB", "serif"; font-size: 11pt;"> </span></span><span style="font-family: "Californian FB", "serif";"><span style="background-color: white;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">“**” A baliza WSPR “CT1BAT” está </span></span></span></span><span style="background-color: white; font-family: "Californian FB", "serif";"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> localizada em IN50SE, </span></span></span><span style="vertical-align: inherit;"><span style="background-color: white; font-family: "Californian FB", "serif";"><span style="vertical-align: inherit;">operativa 24H/24H, emite com 0,100 mW (20 dBm)nas bandas de 80+40+20+17+12+10 metros com uma antena filar de ½ onda em 40M+UnUn, relação 44.1, em inclinação descendente a 45º.</span></span></span><span style="background-color: white; font-family: "Californian FB", "serif";"> </span></b><span style="background-color: white; font-family: "Californian FB", "serif";"><span style="vertical-align: inherit;"></span></span></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com1tag:blogger.com,1999:blog-6092039517214503377.post-40004163675131743892023-01-18T13:44:00.004-08:002023-01-20T02:03:39.893-08:00Antena QHA<p></p><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><b><span style="font-family: helvetica; font-size: x-large;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">QHA</span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> : </span></span></span></span></span></span><u><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">antena QUADRIFILAR HELICOIDAL</span></span></span></span></span></span></u></b> </span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">O </span></span></span></span></span></span><i><b><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">sonho</span></span></span></span></span></span></b></i><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> de alguns radioamadores, consiste num pacote completo! </span></span></span></span></span></span></span></span></span></span></span></span><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">uma </span></span></span><span style="vertical-align: inherit;"><span style="font-size: medium;"><span style="vertical-align: inherit;">antena </span></span></span><span style="font-size: large;"> </span><span style="font-size: medium;"><span style="vertical-align: inherit;"></span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- simples de construir, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- de baixo custo, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- fácil de ajustar, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- banda larga, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- carregar bem, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- baixa ROE, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- mudar de banda sem configurações, </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- não necessitar de sintonizador e </span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">- fazer "as bandas todas"! </span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Não existe, dirão alguns, outros como eu dirão teoricamente/tecnicamente impossível!</span></span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Talvez... mas nada é impossível (com compromisso!)</span></span></span></span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuS9Fi4Lt0sVJ7kpi-I7BgYfi49C6a-x2AVC4xkfBoBCTSInwEKGdve23Fshy2gVzbVc3DU0KB3scggiVAwFNaNF9kf6ZC4wA9CF90zKHeid497Uq1q6XEPCOHccw0MMOPEADdWjL_hVoXQC0rA4hLS5rCx0t-OYiSZG6GyUs6eAU882PNs00vg9au/s3992/1674073099154.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3992" data-original-width="2605" height="280" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuS9Fi4Lt0sVJ7kpi-I7BgYfi49C6a-x2AVC4xkfBoBCTSInwEKGdve23Fshy2gVzbVc3DU0KB3scggiVAwFNaNF9kf6ZC4wA9CF90zKHeid497Uq1q6XEPCOHccw0MMOPEADdWjL_hVoXQC0rA4hLS5rCx0t-OYiSZG6GyUs6eAU882PNs00vg9au/w184-h280/1674073099154.jpg" width="184" /></a></div><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Esta antena tem 70cm de altura, mais a margem de suporte.</span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Consiste em 4 tubos montados de forma helicoidal num tubo de PVC e tem este comportamento (gravado em contínuo "sem truques"!).</span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihkCXEO1EpiHl3m22ld0bFapaOVS-xgngN2LrTrG8eDpCBuC4zvIl3v7dM2vGtTgv99oJlG0a__pE1G14Ah0yh4AWEK21Yrp5jtUuHAgYJXge3_HcieRkDjt3WWD4vmRZT-N7Zgxva74HM1OG6LKPZCoTAdCvqzXno83kerj5KoqqNPMXtuiuQ9t71/s4000/1674052636222.jpg" style="margin-left: 1em; margin-right: 1em; text-align: left;" target="_blank"><img border="0" data-original-height="3000" data-original-width="4000" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihkCXEO1EpiHl3m22ld0bFapaOVS-xgngN2LrTrG8eDpCBuC4zvIl3v7dM2vGtTgv99oJlG0a__pE1G14Ah0yh4AWEK21Yrp5jtUuHAgYJXge3_HcieRkDjt3WWD4vmRZT-N7Zgxva74HM1OG6LKPZCoTAdCvqzXno83kerj5KoqqNPMXtuiuQ9t71/s320/1674052636222.jpg" width="320" /></a></div></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><a href="https://drive.google.com/file/d/1GdrPQ21hnHjkGXSZsTPW5J6Bqr5WunUW/view?usp=share_link"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">https://drive.google.com/file/d/1GdrPQ21h </span></span><br /><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">nHjkGXSZsTPW5J6Bqr5WunUW/view?usp=share_link</span></span></span></span></a><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> (veja em tela cheia)</span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><br /></span></span><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEif6IS0plE6da1tCXLfAlbX_8oz502Hvrdld08yYj9zYdRLk5BdUrHcglG1Z1pAy0cTyVvocQKxkfrAUwbHtoDmWL-WMWlANa1PUetMWDge6rJ0qnikq0HyZ5FW0mVfBdbzYja6CI8064RxfNhMzlsRsKhSR0Vf9xsLkIOcl6_BaSGcDJfpUFpsa120/s4000/1674052636231.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEif6IS0plE6da1tCXLfAlbX_8oz502Hvrdld08yYj9zYdRLk5BdUrHcglG1Z1pAy0cTyVvocQKxkfrAUwbHtoDmWL-WMWlANa1PUetMWDge6rJ0qnikq0HyZ5FW0mVfBdbzYja6CI8064RxfNhMzlsRsKhSR0Vf9xsLkIOcl6_BaSGcDJfpUFpsa120/s320/1674052636231.jpg" width="320" /></a></div></div><div class="separator" style="clear: both; text-align: left;"><span style="font-size: medium;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Esta </span></span></span></span></span></span></span><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">antena, conforme demonstrado "sem filtros", tem valores de forma perfeitamente enquadrados nas bandas de HF e VHF.</span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Claro que, na prática, tem compromissos em emissão nas bandas mais baixas devido ao seu pequeno tamanho, mas já vi "lenguaires" piores!</span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: large;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-size: large; vertical-align: inherit;"><b><u><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Afinal o que é uma antena QHA?</span></span></span></span></span></span></u></b></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Trata-se de uma antena de base quadrifilar e de montagem helicoidal, desenvolvida pelo Dr. CC Kilgus do Laboratório de Fisica da Universidade de John-Hopkins em Silver Spriong nos EUA, por volta dos anos 70.</span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Uma das caraterísticas que mais suscitou o estudo, destacada pelo seu autor, foi o seu padrão de radiação cardioide, alto e estreito, com altos ganhos para o horizonte.</span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: georgia;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; font-size: large; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIk9FUNrev-9-WiohE6yrRAnMRirLInzXW0f2MykJXUYdC9cB08C2Ysy3nxtE__J_oBQu-4Ph1a4gyeH5_WDPcbd6AP2i0j_q1tEH172DxgTn_3qg2NqLgWTAfwgYt_eCQx5Z3iP07GGbb1y4C6_HkMqCoQXecYtT90Yrnq5kYjMunu4ESXVcIHKK9/s741/image.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="333" data-original-width="741" height="180" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIk9FUNrev-9-WiohE6yrRAnMRirLInzXW0f2MykJXUYdC9cB08C2Ysy3nxtE__J_oBQu-4Ph1a4gyeH5_WDPcbd6AP2i0j_q1tEH172DxgTn_3qg2NqLgWTAfwgYt_eCQx5Z3iP07GGbb1y4C6_HkMqCoQXecYtT90Yrnq5kYjMunu4ESXVcIHKK9/w400-h180/image.png" width="400" /></a></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Vários outros investigadores abordaram, mas a principal descoberta foi feita.</span></span></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Hoje, suas características combinadas são usadas principalmente para satélites.</span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Não é pretensão apreciar os aspectos técnicos desta antena mas, apenas, a curiosidade de verificar o seu comportamento na prática!</span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="color: #ff00fe; vertical-align: inherit;"><br /></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="color: #ff00fe; font-size: large; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Dos 1,8 aos 222MHz, com valores de ROE abaixo de 1.3.0 sem sintonizar?!?</span></span></span></span></span></span></span></span></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></span></div><div class="separator" style="clear: both; font-size: large; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9mwbXcS-cBrpK71nzYGRv7bP5yWKyIn-raBouspJ0tB3ANoAr8lgOXyzb7UGDhZ8_x9E3EE-udQX246uX47ZgKdq1aoSBU6K6tXOvfkqwnfXsEEHSMK_o53ViEEcsfkkMgEE6vHhtz2iz7OgSj0D6wWmoKmW-yesy63vFkeoaUprGqrbpdJAHPVFX/s921/QHA%20dados.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="738" data-original-width="921" height="512" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9mwbXcS-cBrpK71nzYGRv7bP5yWKyIn-raBouspJ0tB3ANoAr8lgOXyzb7UGDhZ8_x9E3EE-udQX246uX47ZgKdq1aoSBU6K6tXOvfkqwnfXsEEHSMK_o53ViEEcsfkkMgEE6vHhtz2iz7OgSj0D6wWmoKmW-yesy63vFkeoaUprGqrbpdJAHPVFX/w640-h512/QHA%20dados.jpg" width="640" /></a></div><br /><div class="separator" style="clear: both; font-size: large; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglhHFUJZJQ7MPmY-8RgcrsumAPlN9btYdSCaT_Ei8CjzT8coVsmx5wEPYLsLudPKils_iBR35Qxtlf2yUiHiA1rR3ACUf30pK_BQ97LWTrxJkY1ZDvqNnsC1MtklxV5hlMfC6CXfhUF8RhY6acveLnf3XMpvgJLo7QZdRRop-vXu4s74YrrJPiRyI7/s921/QHA%20montagem.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="691" data-original-width="921" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglhHFUJZJQ7MPmY-8RgcrsumAPlN9btYdSCaT_Ei8CjzT8coVsmx5wEPYLsLudPKils_iBR35Qxtlf2yUiHiA1rR3ACUf30pK_BQ97LWTrxJkY1ZDvqNnsC1MtklxV5hlMfC6CXfhUF8RhY6acveLnf3XMpvgJLo7QZdRRop-vXu4s74YrrJPiRyI7/w640-h480/QHA%20montagem.jpg" width="640" /></a></div><br /><div class="separator" style="clear: both; font-size: large; text-align: left;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Divirta-se! </span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">(e se </span></span></span></span><a href="mailto:ct1bat@gmail.com"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">tiver dúvidas ct1bat@gmail.com</span></span></span></span></a><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> ao dispor, como sempre)</span></span></span></span></span></span></div></div></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium; vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /></span></span></span></span></span></span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-3835586913684086072022-09-29T06:06:00.002-07:002022-09-29T06:08:21.060-07:00Afinem as antenas!<p><span style="background-color: black; color: white;"> <span face=""Segoe UI Historic", "Segoe UI", Helvetica, Arial, sans-serif" style="font-size: 15px; white-space: pre-wrap;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">A baliza WSPR CT1BAT surgiu, nas últimas 20m de fio e um 8º lugar do ranking mundial e em 3º lugar com 0,100W (100 miliwatts) por mérito exclusivo da ANTENA (pouco mais de 20m de fio e um UnUn 49:1) e da máquina fabricada pelo Harry Zachrisson!.</span></span></span></span></p><p><span style="background-color: black; color: white;"><span face=""Segoe UI Historic", "Segoe UI", Helvetica, Arial, sans-serif" style="font-size: 15px; white-space: pre-wrap;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><span style="background-color: black; color: white;"><br /></span></div><span style="background-color: black; color: white;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEghgxlGE2hEsR8lvjOqrByTb-UjSKB5vr0PQFho7e_nuewOG989trZjFgvEPt8YXUE1uESIsJoTmF5DRgDpGZFbeMyOHcqJY_JgXHm9RDoKng3DOHkZujv2rfAyxsh-F8NbKAfXGldeara1r4pfZ3aPtiVd4L_eeaqwFhmKPiGl_OPdWh9YZ6UC9NcK" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="446" data-original-width="508" height="284" src="https://blogger.googleusercontent.com/img/a/AVvXsEghgxlGE2hEsR8lvjOqrByTb-UjSKB5vr0PQFho7e_nuewOG989trZjFgvEPt8YXUE1uESIsJoTmF5DRgDpGZFbeMyOHcqJY_JgXHm9RDoKng3DOHkZujv2rfAyxsh-F8NbKAfXGldeara1r4pfZ3aPtiVd4L_eeaqwFhmKPiGl_OPdWh9YZ6UC9NcK=w298-h284" width="298" /></a><a href="https://blogger.googleusercontent.com/img/a/AVvXsEh0A0w2DK3iwKxw932510gJZupNsoqsVk4guQPqjEmFdRwav0WmODrljzdBTK7cfCB9uN9kSDbmlXPZSGAL3lEApT4Xk83Z30yaBljBOxpZU8hIxsxhG95bCl94XAXqor36joA4Cn8TpE6_9ssXEr_bSXzUxodw72oRRQx9egnQi-5gqCW6tq80nhDP" style="margin-left: 1em; margin-right: 1em; text-align: right;"><img alt="" data-original-height="181" data-original-width="279" height="164" src="https://blogger.googleusercontent.com/img/a/AVvXsEh0A0w2DK3iwKxw932510gJZupNsoqsVk4guQPqjEmFdRwav0WmODrljzdBTK7cfCB9uN9kSDbmlXPZSGAL3lEApT4Xk83Z30yaBljBOxpZU8hIxsxhG95bCl94XAXqor36joA4Cn8TpE6_9ssXEr_bSXzUxodw72oRRQx9egnQi-5gqCW6tq80nhDP=w229-h164" width="229" /></a></span></div><span style="color: white;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEghgxlGE2hEsR8lvjOqrByTb-UjSKB5vr0PQFho7e_nuewOG989trZjFgvEPt8YXUE1uESIsJoTmF5DRgDpGZFbeMyOHcqJY_JgXHm9RDoKng3DOHkZujv2rfAyxsh-F8NbKAfXGldeara1r4pfZ3aPtiVd4L_eeaqwFhmKPiGl_OPdWh9YZ6UC9NcK" style="background-color: black; margin-left: 1em; margin-right: 1em;"><br /></a></span></div><span style="background-color: black; color: white;"><br /><br /></span><p></p><div dir="auto" style="font-family: "Segoe UI Historic", "Segoe UI", Helvetica, Arial, sans-serif; font-size: 15px; white-space: pre-wrap;"><span style="color: white;"><span style="vertical-align: inherit;"><span style="background-color: black; vertical-align: inherit;">(Esclareço que o operador da estação, com o mesmo nome, não teve qq intervenção / dormiu a maior parte do tempo, a noite e sesta!!!)</span></span></span></div><div dir="auto" style="font-family: "Segoe UI Historic", "Segoe UI", Helvetica, Arial, sans-serif; white-space: pre-wrap;"><span style="background-color: black; color: white; font-size: medium;"><br /></span></div><div dir="auto" style="font-family: "Segoe UI Historic", "Segoe UI", Helvetica, Arial, sans-serif; white-space: pre-wrap;"><span style="background-color: black; color: white; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Esqueçam as grandes máquinas (que ficam bem nas fotografias!), os amplificadores e os AT's (para fazerem o</span></span><span style="font-family: inherit;"><a style="cursor: pointer; font-family: inherit;" tabindex="-1"></a></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">trabalho do operador) e AFINEM AS ANTENAS que vale a pena!</span></span></span></div>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-19573840419634935882022-09-26T15:28:00.008-07:002022-09-27T15:30:04.806-07:00CONVERSANDO sobre UNUNs e BALUNs<blockquote style="border: none; margin: 0px 0px 0px 40px; padding: 0px;"><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhXlUjsB95K7dCDgm2SQKIe0QkOtikTwK_ImMlIvIbpDp2G5vifZxo20M2wU6F8wx93SR-MQRvg9NI582dK2v7bucel9Y5DSaJliVl4Gey6bQ5PF25QfjOgr60r1xcUhwXh12LJtq3HLOZddg0uZokEMmft8f-JzsIKShTQ0-jWPoTmVvAHeiqrGrfy" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="2626" data-original-width="3120" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEhXlUjsB95K7dCDgm2SQKIe0QkOtikTwK_ImMlIvIbpDp2G5vifZxo20M2wU6F8wx93SR-MQRvg9NI582dK2v7bucel9Y5DSaJliVl4Gey6bQ5PF25QfjOgr60r1xcUhwXh12LJtq3HLOZddg0uZokEMmft8f-JzsIKShTQ0-jWPoTmVvAHeiqrGrfy" width="285" /></a> <img alt="" data-original-height="4520" data-original-width="3070" height="209" src="https://blogger.googleusercontent.com/img/a/AVvXsEiEPImW5AiHHrys1IDqFC8fZjLaXyIOyCpkXbSnSiqbgIfHzIZWnwXd_bJkBrff1gDQKr49GqooH8qREbN70HbUVLxnRq5JOczs_BOb42GhdlXsCeMNfoO88EB4ebIiaNUSutXjlHZN_4MtBRa5OOu4ZdbOASG0PLvTMALL_Ve21gpDzLM2PnEvlUBN=w163-h209" width="163" /></div></blockquote><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p><p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Há muita linha escrita sobre transformadores de impedância, geralmente conhecidos como BALUNs que, conforme como antenas, são chamadas de BALUN: BAL (antena balanceada ex. Loop) > UN (desbalanceado, do RTX) ou UNUN: UN ( no caso de antena desbalanceada, ex. </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">EndFed)>UN.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">É esta a diferença... para amador entender!</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Depois há escritos para todos os gostos...</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Os que sabem muito disto (os PRO) e que escrevem páginas de fórmulas que levam os “amadores” a desistirem antes do fim da primeira (mas, fica a ideia de que o OM sabe muito disto!).</span></span></span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Os que têm jeito para fazer “coisas bonitas”, que publicam e a gente gosta muito... só que, ainda, não tiveram tempo de experimentar...</span></span></span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">E os que tornam isto simples, para "amadores”. </span></span></span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Abençoados!</span></span></span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Vem isto a propósito de uma publicação, num site de Antenas, de uma peça (bonita) construída por um colega italiano que mereceu vários comentários, dos mais singelos aos mais </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> elaborados</span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> . </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Uns aplaudiram, outros acharam bem e outros, ainda, contaram voltas a menos e torcidas a mais!</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Só que o colega não disse qual era a antena, o uso pretendido ou qual a impedância a transformar. </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Nem disse se serviam 40, 50, 60 ou 70 Ohms! </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Nem com que bandas queria trabalhar.</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Se pretender apenas 1 banda não precisa otimizar e tem melhores resultados. </span><span style="vertical-align: inherit;">Se, por</span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> exemplo, quer usar uma antena dos 6M aos 80M vai ter que aceitar o “compromisso”, de algumas bandas para obter resultados aceitáveis nas restantes.</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">De acordo com a teoria, há um número exato de voltas para uma dada impedância e frequência. </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Como é óbvio, variando a frequência/banda, o valor altera.</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Há um excelente artigo, do nosso colega Basu - VU2NSB sobre o ajuste das antenas EFHW que bem explica https://vu2nsb.com/antenna/wire-antennas/multiband-efhw-antenna/ o que acabo de afirmar.</span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Experimentando:</span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Fomos à bancada fazer o teste!</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Primeiro construi o transformador com as voltas “certas” </span></span></span></span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> como é, normalmente, apresentado o UnUn de 49:1: 2 voltas torcidas no primário e 7+7 voltas no secundário, Usei uma carga de 3K3 Ohm a simular uma antena EFHW e medi:</span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p><p class="MsoNormal"><o:p></o:p></p><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhxDrIv8kHu9mPXSx_zxflmNivkxp_NebnfSOUnZ-Ml4YNsR2Xk0nm8h4cx5cd16TsmzX1nDvGdlbOoYUqOegQgwRdw-8HezsXSFsA1LYOqoZwN1KXFGcbdcxCRGyvcFBMwA3GEUAAirjrQbFjY3CHl5E_Q0spXwunbat6NRbJuJLkL5MKwwNhP7XIT" style="margin-left: auto; margin-right: auto;"><img alt="" data-original-height="4148" data-original-width="3437" height="400" src="https://blogger.googleusercontent.com/img/a/AVvXsEhxDrIv8kHu9mPXSx_zxflmNivkxp_NebnfSOUnZ-Ml4YNsR2Xk0nm8h4cx5cd16TsmzX1nDvGdlbOoYUqOegQgwRdw-8HezsXSFsA1LYOqoZwN1KXFGcbdcxCRGyvcFBMwA3GEUAAirjrQbFjY3CHl5E_Q0spXwunbat6NRbJuJLkL5MKwwNhP7XIT=w332-h400" width="332" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">(clique para ampliar)</span></span></span></span></span></span></span></span></td></tr></tbody></table><br /><p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Resultado: ROE/SWR entre 1.1.1 e 1.1.6 dos 80M aos 6M!</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Claro que há outros parâmetros a ter em conta mas, por simplicidade, cingimo-nos ao ROE.</span></span></span></span></span></span></span></span></span></span></span></span><o:p> </o:p></p><p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">2º ensaio: voltei ao UnUn e, mantendo a carga de 3.300 Ohms, </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">retirei 2 voltas ao secundário (caso do UnUn do colega italiano):</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"></span></span></span></span></p><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhn8h9zdeCHSdpcFHONvbOIUQDnvCtg9ovyxQsrdM_ZWnyZ8JBrUmU6ZkEiM1SU4v5x8xgn3AQ2xh0AmfdbU_UmbuX1utYbSFaA-25glhc6bzZ3b7xdMvBrJDVsL68ClHVH4hUfMZAgP0fyu2yPwCaYrPNNWlqsSUnnflBxM-vLQ-9xjNh_RIMxfHO6" style="margin-left: auto; margin-right: auto;"><img alt="" data-original-height="4624" data-original-width="3472" height="400" src="https://blogger.googleusercontent.com/img/a/AVvXsEhn8h9zdeCHSdpcFHONvbOIUQDnvCtg9ovyxQsrdM_ZWnyZ8JBrUmU6ZkEiM1SU4v5x8xgn3AQ2xh0AmfdbU_UmbuX1utYbSFaA-25glhc6bzZ3b7xdMvBrJDVsL68ClHVH4hUfMZAgP0fyu2yPwCaYrPNNWlqsSUnnflBxM-vLQ-9xjNh_RIMxfHO6=w300-h400" width="300" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">(clique para ampliar)</span></span></span></span></span></span></span></span></td></tr></tbody></table><div class="separator" style="clear: both; text-align: center;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"></span></span></span></div><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><br /><br /></span></span></span><p></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-no-proof: yes;"><v:shape id="Imagem_x0020_2" o:spid="_x0000_i1025" style="height: 588.75pt; mso-wrap-style: square; visibility: visible; width: 441.75pt;" type="#_x0000_t75">
<v:imagedata o:title="" src="file:///C:\Users\JOSE\AppData\Local\Temp\msohtmlclip1\01\clip_image002.png">
</v:imagedata></v:shape></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Resultado: o ROE “detiorou-se”, progressivamente, para cima e para baixo da frequência central.</span></span></span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Conclusão: provavelmente, o UnUn do colega estava de acordo com o seu objetivo que seria trabalhar os 20M nas melhores possíveis.</span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Não querendo usar uma antena nas outras bandas terá, sempre, de intercalar um transformador de impedância para transformar os 3.300 Ohm para o seu sistema de 50 Ohm.</span></span></span></span></span></span></span></span></span></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Quero, com isto, dizer que um UnUn ou BalUn “bem feito” não é uma obra com "x" voltas exatas, numa caixa impressa bonita e com um rótulo: é uma necessidade de cada caso. </span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Funcionando </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> fazendo, medindo e desfazendo para voltar a fazer... experimentando é, afinal, o prazer de um radioamador!</span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">E devo acrescentar: desde que devem estudar, construir e testar os meus transformadores (BalUn / UnUn) bem embalados! </span></span></span></span></span></span></span></span></span></span></span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Por isso, deixo um conselho: se não se sentir à vontade para colocar as mãos na massa e decidir comprar, que seja de fábrica e, no mínimo, testem-no.</span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">73 e divirtam-se (a construir os seus próprios transformadores/se precisarem peçam ajuda).</span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p class="MsoNormal"><o:p></o:p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-74103680132941871912022-02-02T15:43:00.009-08:002023-01-24T10:52:41.487-08:00WSPR<div><span style="background-color: white;"><br /></span></div><div><div class="separator" style="clear: both; text-align: center;"><span><a href="https://blogger.googleusercontent.com/img/a/AVvXsEiLM7ILNP67WcRFefXGRCiIPl5aDePzCp_dfpkG--cNIvdeKN5mSt16fQsFcBeVFDBv9V16PeK5x_Cy-WI8OadH2XxHWWhETLhEiw9PNMl8AZJpPCYkuneGtaPwfgoYUjTv6IJc7jmTebVwijgcF_6KJhiJqhHmIM03kcLQRqmU_HvvbxRKeMQSXaoJ=s1021" style="background-color: white; margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="601" data-original-width="1021" height="377" src="https://blogger.googleusercontent.com/img/a/AVvXsEiLM7ILNP67WcRFefXGRCiIPl5aDePzCp_dfpkG--cNIvdeKN5mSt16fQsFcBeVFDBv9V16PeK5x_Cy-WI8OadH2XxHWWhETLhEiw9PNMl8AZJpPCYkuneGtaPwfgoYUjTv6IJc7jmTebVwijgcF_6KJhiJqhHmIM03kcLQRqmU_HvvbxRKeMQSXaoJ=w640-h377" width="640" /></a></span></div><span style="background-color: white;"><br /> <span style="font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">O WSPR (Lê-se [uíspar] “sussurro” em português) sigla de “Weak Signal Propagation Reporter” é um protocolo, para computador, usado para comunicação de rádio de sinal fraco entre radioamadores, desenhado por Joe Taylor-K1JT há poucos anos .</span></span></span></span><p></p><p class="MsoNormal"><span><span style="font-family: georgia; font-size: medium;"><o:p style="background-color: white;"></o:p></span></span></p><p class="MsoNormal"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Como o próprio nome indica é uma transmissão de sinal fraco, em regra 200mW(ajustável) e permite descodificar sinais de -23dB numa banda com uma largura de 2500 Hz.</span></span><o:p></o:p></span></span></p><p class="MsoNormal"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Destina-se, fundamentalmente, a determinar a controlado por local e por banda. </span><span style="vertical-align: inherit;">É o verdadeiro "propagaciómetro" de que falou o Filipino (RIP).</span></span><o:p></o:p></span></span></p><p class="MsoNormal"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Acoplado a um sistema de antenas permite determinar, em breves minutos, </span></span><span style="mso-spacerun: yes;"> </span><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">qual a que se encontra em melhores condições (Sim/Não) para aquele local.</span></span><o:p></o:p></span></span></p><p class="MsoNormal"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Os sinais recebidos são carregados, automaticamente e no momento, numa base de dados mundial com o nome de WSPRnet </span></span><a href="https://wsprnet.org/"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">https://wsprnet.org</span></span></a><o:p></o:p></span></span></p><p class="MsoNormal"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">O programa, em código aberto, tem vindo a ser desenvolvido por vários OM e conta, atualmente, com cerca de 56.000 usuários em todo o mundo em TX e RX.</span></span><o:p></o:p></span></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Os equipamentos utilizados são desde a construção caseira ou fabricados por QRP Labs, Sotabeams ou Zachtek, com as suas diferenças e para várias bolsas.</span></span><o:p></o:p></span></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Para quem quer documentar sobre o assunto encontra na Web muita informação digitando WSPR.</span></span><o:p></o:p></span></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span style="background-color: white;"><span style="font-family: georgia; font-size: medium;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia; font-size: medium;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEghwghbI4KElj3ubVGJrS6taK9UzJUyFPZTxuY89oVgFz3mxVg3T5K_Ax5l84uUFBZvKiQYqUGX7rgkl7Tro4mfBOrzBupW7scmxKlDnYFUs5oDeCxB9OotcMrxa29e8haj_zaKpOoo64ka2lo8rIwuKkicdDv8h_Hm6GK5tAv04aLRKhClqcZwzzdv=s735" style="background-color: white; clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="551" data-original-width="735" height="150" src="https://blogger.googleusercontent.com/img/a/AVvXsEghwghbI4KElj3ubVGJrS6taK9UzJUyFPZTxuY89oVgFz3mxVg3T5K_Ax5l84uUFBZvKiQYqUGX7rgkl7Tro4mfBOrzBupW7scmxKlDnYFUs5oDeCxB9OotcMrxa29e8haj_zaKpOoo64ka2lo8rIwuKkicdDv8h_Hm6GK5tAv04aLRKhClqcZwzzdv=w200-h150" width="200" /></a></span></div><p class="MsoNormal" style="margin-bottom: 12pt;"><span style="background-color: white; font-family: georgia; font-size: medium;"><br /></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"> A baliza que está ilustrada é a versão TX Desktop 80to10 da Zachtek (Suécia) de 200mW, equipada com GPS, que não necessita de PC podendo funcionar de qualquer lugar com uma fonte de 5V 1A .</span></span></span></p><p></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span><span style="background-color: white; font-family: georgia; font-size: medium;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Baliza autorizada pela ANACOM.</span></span></span></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span style="background-color: white;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;"><span style="font-family: georgia; font-size: medium;">Sinta-se à vontade para usar, (basta selecionar o indicativo da baliza “</span><span style="font-family: verdana; font-size: large;">CT1BAT</span><span style="font-family: georgia; font-size: large;">” que está a funcionar, </span><span style="font-family: verdana; font-size: medium;"> </span></span></span></span><span style="font-family: verdana; font-size: medium;"><span style="background-color: white;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">24x7x365, desde Coimbra (IN50), </span></span></span><span style="background-color: white;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">ligado a uma EFHW-1/2 onda 40M em sloper a 45º, descendente, omnidirec. vertical nas bandas de 80+40+20+17+12+10M.</span></span></span></span></p><p class="MsoNormal" style="margin-bottom: 12pt;"><span style="font-family: georgia; font-size: medium;"><o:p></o:p></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhoUVlWdGJ2UZOAZGN6gBnFwvzjoMbsU9EqNEne61HTQOZ6ySjYPr0_X_MtqOVFRRuGvSfpAQe649ZmQF9Wd0rdu18TNy7_oAHRtia2W02qG8uh0nVqB-9LaONR7Bs3IxFZyHCZkcXWrJg3Cr2lnY-8H62CgafUMXWYQLu6Wxy5v01b19Ug7Npwy3OY=s743" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="110" data-original-width="743" height="94" src="https://blogger.googleusercontent.com/img/a/AVvXsEhoUVlWdGJ2UZOAZGN6gBnFwvzjoMbsU9EqNEne61HTQOZ6ySjYPr0_X_MtqOVFRRuGvSfpAQe649ZmQF9Wd0rdu18TNy7_oAHRtia2W02qG8uh0nVqB-9LaONR7Bs3IxFZyHCZkcXWrJg3Cr2lnY-8H62CgafUMXWYQLu6Wxy5v01b19Ug7Npwy3OY=w640-h94" width="640" /></a></div><br /><span style="color: white;"><br /></span><p></p></div>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-48443884335972044722021-10-21T09:36:00.001-07:002021-10-21T09:40:32.021-07:00PERDAS DE RETORNO<p><span style="font-family: georgia;"> Ás vezes esquecemo-nos de nós próprios!</span></p><p><span style="font-family: georgia;">Lembra-me, hoje, o Facebook* que, há 2 anos publiquei uma experiência vivida (e aprendida!) na construção de uma antena para um colega e amigo e, pasmem, esqueci de a partilhar, no meu blogue, com os colegas que não usam aquela rede.</span></p><p><span style="font-family: georgia;">Sendo o tema, a observação das "Perdas de Retorno" etapa essencial na construção/instalação /acoplamento de uma antena, aqui o replico na esperança de que seja útil a alguém.</span></p><p><span style="font-family: georgia;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfjkWuPz9KREaAPHIdeN0gxcDRg8RHK5xl4lBwtZgdAkt-LMiGsafZW6q8y3q9ZopfBSr8czJ6DpiV5M0at11kBDFsF2IDp50R56hX9kJBEjait5QghWp6ktT0qwlK-e6HK4yxGn9wFkA/" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="417" data-original-width="580" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfjkWuPz9KREaAPHIdeN0gxcDRg8RHK5xl4lBwtZgdAkt-LMiGsafZW6q8y3q9ZopfBSr8czJ6DpiV5M0at11kBDFsF2IDp50R56hX9kJBEjait5QghWp6ktT0qwlK-e6HK4yxGn9wFkA/s16000/image.png" /></a></span></div><span style="font-family: georgia;"><a href="https://drive.google.com/file/d/1OfvOEEQnPLEB_GBlodZKPkkl4mCIWL1Y/view?usp=sharing" target="_blank">https://drive.google.com/file/d/1OfvOEEQnPLEB_GBlodZKPkkl4mCIWL1Y/view?usp=sharing </a><div class="separator" style="clear: both; text-align: center;"><a href="https://drive.google.com/file/d/1OfvOEEQnPLEB_GBlodZKPkkl4mCIWL1Y/view?usp=sharing" target="_blank"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf4-9eNh-Sw5OrFmNjssj0ZEjP3ttZsCeG6VY1OB6NQlJh1FK-Eljzd_3HVZZXgWYrAPQlJP0C84w1qwzb6_gIwFTwhDocFFoKj9foQuNLeF95xbOmDKNFgPDMHk73nZ6vJsg2gLlxjkg/" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="384" data-original-width="512" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf4-9eNh-Sw5OrFmNjssj0ZEjP3ttZsCeG6VY1OB6NQlJh1FK-Eljzd_3HVZZXgWYrAPQlJP0C84w1qwzb6_gIwFTwhDocFFoKj9foQuNLeF95xbOmDKNFgPDMHk73nZ6vJsg2gLlxjkg/w640-h480/image.png" width="640" /></a></div><br /></span><p></p><p><span style="font-family: georgia;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYoCvteX3sVOUoq-NIKm_pz5KIY4-Kffgo4wGyNwQJgPDKf46rIqI5v4tVj5tJC65olSpq5rRJF87duiDpXRuzNjVu_s_gonJYxpodizrI4PaX7B1Koieua44QUgvkkxArQCc7qGkgW00/" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYoCvteX3sVOUoq-NIKm_pz5KIY4-Kffgo4wGyNwQJgPDKf46rIqI5v4tVj5tJC65olSpq5rRJF87duiDpXRuzNjVu_s_gonJYxpodizrI4PaX7B1Koieua44QUgvkkxArQCc7qGkgW00/" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7VTAlCQlNqKBzNLzOL-omtr4NIf-Ep8mYMxL-7Je8ExMoz0jF9w53IehfpKKZKwomASvRG4B6mCAXR6PgvaEVst3ZqVkyt8jePlnsrZAcoRxzBixEIbNHhyzZ7xl6aUvUVVJMZzMfR64/" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img alt="" data-original-height="960" data-original-width="720" height="406" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7VTAlCQlNqKBzNLzOL-omtr4NIf-Ep8mYMxL-7Je8ExMoz0jF9w53IehfpKKZKwomASvRG4B6mCAXR6PgvaEVst3ZqVkyt8jePlnsrZAcoRxzBixEIbNHhyzZ7xl6aUvUVVJMZzMfR64/w304-h406/image.png" width="304" /></a></div><br /><br /></span></div><p><span style="font-family: georgia;"><span style="font-family: georgia;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: georgia;"><span style="font-family: georgia;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM0-0mSMYgMQpWaDubomwFIFoERzZ33moWDFX4rhoPh2kSCPope4HSv1nQgIYAc9ySZTHUGUJ9TGPtVuV6G1USe1AAciI8thnW3iUwJ9fgPoj9Nc8dDVdmER4no9UJCnaJqSWx_hdbJFo/" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="960" data-original-width="720" height="483" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM0-0mSMYgMQpWaDubomwFIFoERzZ33moWDFX4rhoPh2kSCPope4HSv1nQgIYAc9ySZTHUGUJ9TGPtVuV6G1USe1AAciI8thnW3iUwJ9fgPoj9Nc8dDVdmER4no9UJCnaJqSWx_hdbJFo/w362-h483/image.png" width="362" /></a></span></span></div><span style="font-family: georgia;"><div class="separator" style="clear: both; text-align: center;"><br /></div>*Digam lá que o FB não tem "coisas boas"... às vezes até nos ajuda a conhecer melhor algumas pessoas!</span><p></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-87838912092216766792020-11-28T10:45:00.002-08:002020-11-28T10:45:20.184-08:00Antena para UHF (h=52cm) com 6 DBi de ganho!<p><span style="font-family: helvetica;"> Construir uma antena para UHF (432MHz / 70cm) com 6DBi de ganho? Com uma largura de cerca de 7MHz e um ângulo de fogo inferior a 10º?</span></p><p><span style="font-family: helvetica;">Muito fácil, mais barato e mais rápido que ir à loja e por um custo insignificante (uma PL)...</span></p><p><span style="font-family: helvetica;">Material:</span></p><div style="text-align: left;"><span style="font-family: helvetica;">- 108cm de fio grosso ou tubo de cobre ou aluminio (recomendado 6mm);</span></div><div style="text-align: left;"><span style="font-family: helvetica;">- 1 PL de chassis (SO239).</span></div><p><span style="font-family: helvetica;"><br /></span></p><p style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-l9eyHw_RyNcp6L-XMMiYAkDzh541_2ob53WM6J9_nWN26B0_pavt5rQz3anIXq_SOqhxbjBhuv98L76YgmJ_igTr_yzlvfM_jX2LY40o2uQ6Ewz6duKxsqnLJ7rVnOLM2cHtPRwRa7g/s574/esquema.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="574" data-original-width="403" height="447" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-l9eyHw_RyNcp6L-XMMiYAkDzh541_2ob53WM6J9_nWN26B0_pavt5rQz3anIXq_SOqhxbjBhuv98L76YgmJ_igTr_yzlvfM_jX2LY40o2uQ6Ewz6duKxsqnLJ7rVnOLM2cHtPRwRa7g/w313-h447/esquema.jpg" width="313" /></a></p><span style="font-family: helvetica;">Marque as distâncias no fio/tubo de acordo com as medidas acima: D|C|B|C|F.<br />Faça as dobras C.</span><div><span style="font-family: helvetica;">Una as pontas com um pedaço de tubo plástico e coloque manga retrátil ou cola.</span></div><div><span style="font-family: helvetica;"><b>Afinação:</b></span></div><div><span style="font-family: helvetica;">parta do ponto A (36mm) e, lentamente para cada uma das pontas (malha para a extremidade), procure o ponto dos 50 Ohm e menor ROE.</span></div><div><span style="font-family: helvetica;"><br /></span></div><div><span style="font-family: helvetica;">O resultado? Pode ver nas imagens abaixo!</span></div><div><span style="font-family: helvetica;"><br /></span><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHG-1JoSndyk7vRdcXv_sjl5mjJry_hv1-9r-xWf109YoVRO8ByisfR8SCr_3IqQUhsunlLYSYe4ROhRLCfagKiWC4RvCSeYA1Lhkqy9mX7AqGZ16mxp5DP6my_fxJWFI84rc4b10ySLs/s2048/IMG_20201126_163703.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHG-1JoSndyk7vRdcXv_sjl5mjJry_hv1-9r-xWf109YoVRO8ByisfR8SCr_3IqQUhsunlLYSYe4ROhRLCfagKiWC4RvCSeYA1Lhkqy9mX7AqGZ16mxp5DP6my_fxJWFI84rc4b10ySLs/s320/IMG_20201126_163703.jpg" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdUYddcczajBu3PPd0GLGAylzqQ_Ur9U9KIWpxeBIGYIXVbItgB_ujRNB4XEcJ-5mIAcz0DNgJZYnwE1rD_KnDTa_6qvdDikaDOsoMJsM3oGC96f-UzOwaeWRd3yXvyZ1GXvw_bNxpaWQ/s2048/IMG_20201126_174801.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdUYddcczajBu3PPd0GLGAylzqQ_Ur9U9KIWpxeBIGYIXVbItgB_ujRNB4XEcJ-5mIAcz0DNgJZYnwE1rD_KnDTa_6qvdDikaDOsoMJsM3oGC96f-UzOwaeWRd3yXvyZ1GXvw_bNxpaWQ/s320/IMG_20201126_174801.jpg" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjTpp9J1o1-ST1giOAzw8_0aC8kJLb-9v0twpx_EDWICavHlQz0ziHUW3Q9ptDQD5P1egQZWs8uqdL3o-xT4soGAPhk3gaxW65wnBKkvrJUVFCmnQGbvUIdD27qpF3xV0QqTwk5wjN6sQ/s2048/IMG_20201126_174837.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjTpp9J1o1-ST1giOAzw8_0aC8kJLb-9v0twpx_EDWICavHlQz0ziHUW3Q9ptDQD5P1egQZWs8uqdL3o-xT4soGAPhk3gaxW65wnBKkvrJUVFCmnQGbvUIdD27qpF3xV0QqTwk5wjN6sQ/s320/IMG_20201126_174837.jpg" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: helvetica;">(Não se preocupe demasiado com os valores apresentados em S11... são muitos anos a fazer e testar antenas (!) e raramente encontra estes valores de fábrica!)</span></div><br /><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0zdvqygC3VKeVrKFafWmeYF-FAne_PiFvnHYcOwGYA5GEt99ANoESguBf0FcbzvuoAJ9r1PI3I8rdZ3nxkkRJANgMqDyCvAEn8GqJLrFM33FAFSYKHNsbSCSVvxM_C1xOZGM_a8cRTpY/s2048/IMG_20201126_175613.jpg" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0zdvqygC3VKeVrKFafWmeYF-FAne_PiFvnHYcOwGYA5GEt99ANoESguBf0FcbzvuoAJ9r1PI3I8rdZ3nxkkRJANgMqDyCvAEn8GqJLrFM33FAFSYKHNsbSCSVvxM_C1xOZGM_a8cRTpY/s320/IMG_20201126_175613.jpg" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;">(antenas afinadas em 450MHz para um amigo)<br /></td></tr></tbody></table><br /><span style="font-family: helvetica;">Mãos à obra e... divirta-se!</span></div><div><span style="font-family: helvetica;"><br /></span></div><div><span style="font-family: helvetica;"><span style="font-size: x-small;"><b>NOTA: Não fabrico para venda. Se tiver dúvidas, contate-me que eu ajudo-o.</b></span><br /></span><br /><p><br /></p></div>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-65512884912507887692020-11-25T11:49:00.012-08:002020-11-25T16:57:38.085-08:00QHF antena LHCP para satélite NOOA (137,5MHz)<div style="text-align: left;"><br /> Há quem diga que recebe satélites até com chicote de borracha! <br />É possível, dependendo do satélite e (muito!) do acaso/coincidência da passagem e da direção.</div><div style="text-align: left;">Mas, para se escutar com eficácia e fazer emissão, naqueles em que é possível, é preciso escolher o momento da passagem, mais próxima da sua localização, o azimute e ter uma antena com direcionalidade bastante para apontar o satélite. </div><div style="text-align: left;">Isto para amadores! </div><div style="text-align: left;">Claro que, para os "profissionais" há equipamento adequado desde software, para indicar passagens e variações de frequência conforme a aproximação ou afastamento, antenas e rotores azimutais.</div><div style="text-align: left;">Para quem faz isto de vez em quando (e não pensa na profissionalização 😃) há modos mais simples e baratos.</div><div style="text-align: left;">Hoje deixo-lhes uma forma barata (!) de construir uma antena devidamente testada (aqui só se publicam projetos testados pelo autor!) para receber os satélites NOOA (meteorológicos) ajustada para os 137,5MHz, com a vantagem de ter receção omnidirecional.</div><div style="text-align: left;"><br /></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3cLU_25BWddhM20s1iH9nXgczPQSxVz7lCbbV5RQRhlEoIqRLALlGJKTAG8DoCHWE6AdvUkw8JX_oLtfjewpyODbhnawqEr1aPtZtRIwoZb20WPBz4bQ_CUqn8hvsVNLhTqnmsQixdok/s2048/QFH+made+CT1BAT.jpg" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="376" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3cLU_25BWddhM20s1iH9nXgczPQSxVz7lCbbV5RQRhlEoIqRLALlGJKTAG8DoCHWE6AdvUkw8JX_oLtfjewpyODbhnawqEr1aPtZtRIwoZb20WPBz4bQ_CUqn8hvsVNLhTqnmsQixdok/w282-h376/QFH+made+CT1BAT.jpg" width="282" /></a></div><b><u><div style="text-align: left;"><b><u><br /></u></b></div><div style="text-align: left;"><b><u><br /></u></b></div><div style="text-align: left;"><b><u><br /></u></b></div><div style="text-align: left;"><b><u><br /></u></b></div>QHF Antena quadrifilar LHCP (circular esquerda)</u></b></div><div style="text-align: left;">Material utilizado:<br /></div><div style="text-align: left;">- 70cm de tubo PVC 50mm;</div><div style="text-align: left;">- 1 tampa;</div><div style="text-align: left;">- 1,5m de coaxial;</div><div style="text-align: left;">- 1 PL de chassis;</div><div style="text-align: left;">- 2x118,1m de tubo de cobre 6mm;</div><div style="text-align: left;">- 2x111,4m de tubo de cobre 6mm;</div><div style="text-align: left;">- 1 dose de gosto + 1 de habilidade (!!!)</div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div><div style="text-align: left;">Os ângulos do tubo sem vincar fazem-se, facilmente, com um alicate de dobragem (ou outra).<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigjmcXa5kPHVsSmKCaG4EiUSp6QxVlreiTPw3mAnYbndnomegyJhYrX2qGcBOdchsrn63ogu-znuztvzJq-I5u7-btcuxQTyFhHcHIh64o2cI0DDhEt6f133lrP_lBJPvbahWa2sJTv1M/s219/dobrar+tubo.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="210" data-original-width="219" height="159" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigjmcXa5kPHVsSmKCaG4EiUSp6QxVlreiTPw3mAnYbndnomegyJhYrX2qGcBOdchsrn63ogu-znuztvzJq-I5u7-btcuxQTyFhHcHIh64o2cI0DDhEt6f133lrP_lBJPvbahWa2sJTv1M/w167-h159/dobrar+tubo.jpg" width="167" /></a></div></div><br /><div style="text-align: left;"><br /></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWBNHrO9z9bjw7ckWng6d4Qx9exzuR1oKQeIFXVLf1poOQ_BD_MrEjtX3kojj7X_-oNrQhX26ITNy16z2xCthQBj5PHY9f6YnlbZ_TuuZidvWlMgEQxtxBzMO9mC3FvHJxQE0xbju3J4A/s761/esquema.jpg" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="761" data-original-width="508" height="544" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWBNHrO9z9bjw7ckWng6d4Qx9exzuR1oKQeIFXVLf1poOQ_BD_MrEjtX3kojj7X_-oNrQhX26ITNy16z2xCthQBj5PHY9f6YnlbZ_TuuZidvWlMgEQxtxBzMO9mC3FvHJxQE0xbju3J4A/w364-h544/esquema.jpg" width="364" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWBNHrO9z9bjw7ckWng6d4Qx9exzuR1oKQeIFXVLf1poOQ_BD_MrEjtX3kojj7X_-oNrQhX26ITNy16z2xCthQBj5PHY9f6YnlbZ_TuuZidvWlMgEQxtxBzMO9mC3FvHJxQE0xbju3J4A/s761/esquema.jpg" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="text-align: left;">A afinação é feita no comprimento dos elementos </span><span style="text-align: left;">(sugere-se na parte inferior). </span></a></div></div><div style="text-align: left;"><br /><br /></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZXIdbCF32f2MJwPlp8STE19V1cNyEooDCAZGqUYAnadR2BQTIaMF4fNoJBl0sFnzIgAyeCfCvXvYGOd_sIunS84DmnnMmfH-wvIWhAdlSyn4hSnY4WW3pyt5-_AaagAVyvNAQiAwAkBc/s174/balun.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="174" data-original-width="140" height="100" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZXIdbCF32f2MJwPlp8STE19V1cNyEooDCAZGqUYAnadR2BQTIaMF4fNoJBl0sFnzIgAyeCfCvXvYGOd_sIunS84DmnnMmfH-wvIWhAdlSyn4hSnY4WW3pyt5-_AaagAVyvNAQiAwAkBc/w81-h100/balun.jpg" width="81" /></a></div></div><div style="text-align: left;"><br /></div><div style="text-align: left;">Abaixo da fixação superior (+- 5cm) faz-se um furo, para o cabo sair, dar 4 voltas completas (choque de RF*) e volta a entrar dentro do tubo até próximo da base, onde liga a uma PL de chassis, ali fixada.<div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><span style="text-align: left;">Sugestões de montagem: rosca interior no tubo, parafuso com anilha</span></div><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb3wr8f140OdefSGDzZn-S5caIUoAuRjzoZBXE1pNCKkuqTYg8cwbbnKUZo9ifI97kWabeHYIhR0mCeq5psPjtmSFXpi-MOdXR-0vnrufiQeKiJJ8FHK-Wg_uUhXlqyNv4gV6inaSp4kY/s936/LIGA%25C3%2587%25C3%2595ES.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="304" data-original-width="936" height="208" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb3wr8f140OdefSGDzZn-S5caIUoAuRjzoZBXE1pNCKkuqTYg8cwbbnKUZo9ifI97kWabeHYIhR0mCeq5psPjtmSFXpi-MOdXR-0vnrufiQeKiJJ8FHK-Wg_uUhXlqyNv4gV6inaSp4kY/w640-h208/LIGA%25C3%2587%25C3%2595ES.jpg" width="640" /></a></div><br /></div></div></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOcPIL_pg9gCWM-iyLhs0ZEsz-Q1buj1AN45Iyzjg8y-tO5jpEq-WL1ATBm8AeAMMntR5sc7ZM9VLv2kPuIRO8m193oqigxdlU-VUyadv9b-ud5r_B-QeAQnrEc0VwJ5ecw5MWLgQ3lLs/s453/comercio.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="332" data-original-width="453" height="112" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOcPIL_pg9gCWM-iyLhs0ZEsz-Q1buj1AN45Iyzjg8y-tO5jpEq-WL1ATBm8AeAMMntR5sc7ZM9VLv2kPuIRO8m193oqigxdlU-VUyadv9b-ud5r_B-QeAQnrEc0VwJ5ecw5MWLgQ3lLs/w152-h112/comercio.jpg" width="152" /></a></div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div>O custo estimado é de <u><i><span style="font-size: medium;"><b>menos de €20</b></span> </i></u>(na CE encontrei esta antena à venda entre €200 e €250+portes).</div><br /><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><span style="text-align: left;">O resultado final é o que consta da foto.</span></div><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRMSgLVLi2sSlOZ44UqziWbd4oThyphenhyphenYX9vh2ceRhGBqtVXe8PbUKQ1r6KKsbVchJdFKN4ebMwupNgT2q87kqtCspPYAAGT2Z8B3oy5ykKqfKgDe0604vFwcb_QA4pNNLdRgUA1glP-XxDA/s2048/resultados.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1288" data-original-width="2048" height="251" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRMSgLVLi2sSlOZ44UqziWbd4oThyphenhyphenYX9vh2ceRhGBqtVXe8PbUKQ1r6KKsbVchJdFKN4ebMwupNgT2q87kqtCspPYAAGT2Z8B3oy5ykKqfKgDe0604vFwcb_QA4pNNLdRgUA1glP-XxDA/w400-h251/resultados.jpg" width="400" /></a></div></div></div><div style="text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz97bFzQdXnN3Bs55w3Xm5eakYH9miPQvS3h5tR95Zt3E5wVehDoyL07sADSnNmESwFcYsw_LZxa40qFJX92ClMP4gdHccRiY9-s-DEWfZRGO0CczGN_TBuWKnK1fqh7ryWc8axGr3E3g/s2048/IMG_20201102_201345.jpg" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><br /></a></div>Se quiser ler mais sobre os satélites meteorológicos ou de amador, clique <b><a href="https://www.arsatc.org/noaa.html" target="_blank">aqui</a>.</b></div><div style="text-align: left;"><br /></div><div style="text-align: left;">Mãos à obra e bom trabalho!</div><div style="text-align: left;"><br /></div><div style="text-align: left;"><br /></div><span style="background-color: white; color: #555555; font-family: trebuchet; letter-spacing: -0.06em; margin: 0px; padding: 0px;">*A s</span><span style="background-color: white; color: #555555; font-family: trebuchet; letter-spacing: -0.06em; margin: 0px; padding: 0px;">ua função é a de ajudar a eliminar correntes de RF de fluir do lado externo do cabo coaxial.</span>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-3449839203629025972020-10-11T08:06:00.011-07:002023-10-14T14:33:47.510-07:00"SLIM JIM" em memória de F.C. JUDD-G2BCX<p><span style="background-color: white; font-family: verdana;"><span style="font-size: medium;"> </span><span style="font-size: medium;">Longe vai o ano de 1980. O VHF tinha acabado de chegar... eram poucos os radioamadores equipados com VHF.</span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana;"><span style="font-size: medium;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4Lv2neBpho3ZxKO8sk4dkWzpZeYVV3ND7ipBQcYwFzqhXFMJfbf916KGm6-oA5zEm7IZqcd4fkcKxtYW8EktDXiXc91cge14pnMmvbNIo0kmArNWxEpBqlOPCVOfSFFpAL9Pr1EYdBPw/s1609/IMG_20201011_141930.jpg" style="background-color: white; margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1113" data-original-width="1609" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4Lv2neBpho3ZxKO8sk4dkWzpZeYVV3ND7ipBQcYwFzqhXFMJfbf916KGm6-oA5zEm7IZqcd4fkcKxtYW8EktDXiXc91cge14pnMmvbNIo0kmArNWxEpBqlOPCVOfSFFpAL9Pr1EYdBPw/s320/IMG_20201011_141930.jpg" width="320" /></a></span></span></div><span style="font-family: verdana;"><span style="background-color: white; font-size: medium;"><br /></span></span><p></p><p><span style="background-color: white; font-family: verdana; font-size: medium;">Num contato, em HF, com a estação G2BCX o operador Judd (falecido há poucos anos) fala, com entusiasmo, da nova antena que tinha inventado, a SLIM JIM e passa-me as medidas. Convém lembrar, sobretudo àqueles que nasceram nos últimos 30 anos que a Internet era algo com que nem se sonhava!</span></p><p><span style="background-color: white; font-family: verdana; font-size: medium;">Com os fracos recursos que existiam na época, o que mais se aproximava era a antena de TV do canal 3 da Lousã que (aproveitando o trombone) ajustado para as medidas se chegava a uma antena que "carregava" bem e chegava. Sim porque, naquele tempo, ainda nem se sonhava com os analizadores de antena e os medidores de ROE/SWR, para VHF, eram raros e caros.</span></p><p><span style="background-color: white; font-family: verdana; font-size: medium;">Vai-se à sucata (sempre!) e nasce a primeira SLIM JIM que, depois de testadas muitas e variadas versões, continua a ser a <b>antena vertical de VHF "de eleição"</b>.</span></p><p><span style="font-size: medium;"><span><span style="font-family: verdana;"><span style="background-color: white;">Eu não a poderia descrever melhor que Don-N4UJW em Hamuniverse.com: "... <span style="text-align: -webkit-center;"><span><span style="vertical-align: inherit;">A antena</span></span></span><span style="text-align: -webkit-center;"><span><span><span style="vertical-align: inherit;"> Slim Jim ... </span></span></span></span></span></span></span><span><span style="font-family: verdana;"><span style="text-align: -webkit-center;"><span><span><span style="vertical-align: inherit;">é uma antena omnidirecional </span></span></span></span></span><span style="font-family: verdana; text-align: -webkit-center;"><span style="vertical-align: inherit;">polarizada </span></span></span><span style="font-family: verdana; text-align: -webkit-center;"><span><span><span style="vertical-align: inherit;">verticalmente com "ganho" considerável e está concentrada ... em direção ao horizonte em vez de em direção ao céu, tornando-a mais eficiente do que uma antena do tipo plano de terra em cerca de 50% melhor. </span></span></span></span><span style="font-family: verdana; text-align: -webkit-center;"><span style="vertical-align: inherit;">Pode ser construída para quase todas as frequências! </span></span><span style="font-family: verdana; text-align: -webkit-center;"><span style="vertical-align: inherit;">Devido ao seu design SLIM, há muito pouca carga de vento. </span></span><span style="font-family: verdana; text-align: -webkit-center;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">É alimentada com cabo coaxial de 50 ohms (direto!). </span></span></span><span style="font-family: verdana;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">Ela usa um esboço de correspondência do tipo 'J' (J Integrated Matching = JIM), daí o nome SLIM JIM. </span><span style="vertical-align: inherit;">O crédito pelo design original vai para FC Judd, G2BCX. </span><span style="vertical-align: inherit;">Uma vez que o ângulo vertical de radiação é tão estreito, cerca de 8 graus em direção ao horizonte, ela geralmente tem desempenho de 5/8 de onda ... construção do tipo plano de terra devido ao seu ângulo de radiação muito maior. </span><span style="vertical-align: inherit;">Estima-se que a Slim Jim parece ter cerca de 6dB de ganho ... uma antena de </span></span></span><span style="font-family: verdana;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">5/8 de </span></span></span><span style="font-family: verdana;"><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">onda devido ao ângulo de radiação extremamente baixo." Há muitos artigos, na Web, sobre a SLIM JIM.</span></span></span></span></p><p><span><span style="background-color: white; font-family: verdana; font-size: medium;">Esta semana (para entender as experiências de um colega...) resolvi construir uma J e uma SLIM JIM, para comparar. </span></span></p><div class="separator" style="clear: both; text-align: left;"><span style="background-color: white; font-family: verdana; font-size: medium;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9BtPDfV4pAgU4nxNieD5utr-l_AW6Fy7V_8fYKfHNFlO4icwJ7DmHpydELDeEk3awYYXZLgKW03GTRYOwDQ5_AwrlbsjMCFi-znv1qk5s-izhXk-bdD8piCW3B9uQF2sLCgjWupjSKTk/s373/grafico+slim092020.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="373" data-original-width="280" height="281" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9BtPDfV4pAgU4nxNieD5utr-l_AW6Fy7V_8fYKfHNFlO4icwJ7DmHpydELDeEk3awYYXZLgKW03GTRYOwDQ5_AwrlbsjMCFi-znv1qk5s-izhXk-bdD8piCW3B9uQF2sLCgjWupjSKTk/w211-h281/grafico+slim092020.jpg" width="211" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqVAVO6dmMt9A6ll9KcEzAYVW4KPdwiWmlJ1PY42G6GJsx39WTwMVv2cSoSrHHDhrJAJyyTOyQ4igJ9GlmMlKAGl8BTksQZ_d81pvzZ0sydWjf-zNMrnaDnV-pemFZbhZmDOq7-ZXp2ko/s373/medidas+slim092020.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="373" data-original-width="280" height="269" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqVAVO6dmMt9A6ll9KcEzAYVW4KPdwiWmlJ1PY42G6GJsx39WTwMVv2cSoSrHHDhrJAJyyTOyQ4igJ9GlmMlKAGl8BTksQZ_d81pvzZ0sydWjf-zNMrnaDnV-pemFZbhZmDOq7-ZXp2ko/w202-h269/medidas+slim092020.jpg" width="202" /></a></span></div><span style="background-color: white;"><span style="font-family: verdana; font-size: medium;"><br /></span><span style="font-family: verdana; font-size: medium;">Depois de vários estudos (medições finais nas fotos, para que não haja dúvidas...), </span></span><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: medium;"><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgli0jiPlwIsX72uhsUVPl2My51wL4LQNsRWy6m28ddAVTPKVQjwqQ1iYgYw-hY3pji2T1O9ORxbPPRPb5HpxLabszPb-sAcNGb8lvHbNmW7Iy7xnF_4aKkDc0k0nTiipBbAcUazJk5l_I/s2048/IMG_20201009_181615.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgli0jiPlwIsX72uhsUVPl2My51wL4LQNsRWy6m28ddAVTPKVQjwqQ1iYgYw-hY3pji2T1O9ORxbPPRPb5HpxLabszPb-sAcNGb8lvHbNmW7Iy7xnF_4aKkDc0k0nTiipBbAcUazJk5l_I/s320/IMG_20201009_181615.jpg" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhz9GihYUQC9TWOPY9lT5y9zQlw_4tn1Ezlhi20abB2w7uRFHrHTbQ240ppeeBzD0iTDYXPJqmehSms4gFaT6v9_59ECUTQzGSEGpOkhrWcyG6NqldPNe4Hps3xM1KAVPmxJTD5WlHOVxU/s2048/IMG_20201011_124452.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="358" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhz9GihYUQC9TWOPY9lT5y9zQlw_4tn1Ezlhi20abB2w7uRFHrHTbQ240ppeeBzD0iTDYXPJqmehSms4gFaT6v9_59ECUTQzGSEGpOkhrWcyG6NqldPNe4Hps3xM1KAVPmxJTD5WlHOVxU/w268-h358/IMG_20201011_124452.jpg" width="268" /></a></div></div><br /></span></div></div><span style="font-size: medium;"><span style="background-color: white; font-family: verdana;"><br /><br /><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTQhZfatT4E-5-3SzUND0DNg0lXcwlLnDnEEHdp0RlqRzsbDFgaZBHQAH4tz_OjyWFBnhGZgpxZXZ0I9M4kqsBPyQ0CD9ex4V1zixhACcCGE9SNwvnR21jUWlQzcyJzGQJavs4Fb-q6gU/s2048/IMG_20201011_124337.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTQhZfatT4E-5-3SzUND0DNg0lXcwlLnDnEEHdp0RlqRzsbDFgaZBHQAH4tz_OjyWFBnhGZgpxZXZ0I9M4kqsBPyQ0CD9ex4V1zixhACcCGE9SNwvnR21jUWlQzcyJzGQJavs4Fb-q6gU/w214-h285/IMG_20201011_124337.jpg" width="214" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjH6CHT29zxE1Czp9Dv-qxfd-Nyb2cUwOcyvHkRwDX1IkrS6OKd_yB7ng-8-TFV849rBz0VyijGJLnJcitwolv1UDL_qhVgtW5gXZK167gNFI1NuDY6QPiD0NNXfpQmNfoh-87uxjqEFo/s2048/IMG_20201011_124324.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjH6CHT29zxE1Czp9Dv-qxfd-Nyb2cUwOcyvHkRwDX1IkrS6OKd_yB7ng-8-TFV849rBz0VyijGJLnJcitwolv1UDL_qhVgtW5gXZK167gNFI1NuDY6QPiD0NNXfpQmNfoh-87uxjqEFo/s320/IMG_20201011_124324.jpg" /></a></div><div class="separator" style="clear: both; text-align: justify;"><span style="text-align: left;">optei por "envelopar" a SLIM JIM que, devido ao atraso dos correios, o colega pode vir levantar!</span></div><p style="font-family: "Times New Roman"; font-size: medium; text-align: left;"></p><p style="font-family: "Times New Roman"; font-size: medium; text-align: left;"><span><span style="font-family: verdana; font-size: medium;"></span></span></p><div class="separator" style="clear: both; font-family: "Times New Roman"; font-size: medium;"><div class="separator" style="clear: both;"><span style="font-family: verdana; font-size: medium;"></span></div></div></div></span><span style="background-color: #cccccc;"><span style="font-family: verdana;">Para quem se quiser entreter a construir uma antena simples, por baixo custo e com performance que não tem comparação no mercado (!) </span><span style="font-family: verdana;">arranje 3m de cobre/aluminio (tubo ou vara), um analisador e paciência q.b. e </span><span style="font-family: verdana;">tem aqui a calculadora do John (e a minha ajuda, se precisar):</span></span></span><p></p><p><span style="font-family: verdana; font-size: medium;"><a href="https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/" style="background-color: #cccccc;">https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/</a></span></p><p><span style="background-color: #cccccc; font-family: verdana; font-size: medium;">Divirta-se!</span></p><p><span style="background-color: white; font-family: verdana; font-size: medium;"><br /></span></p><p><span style="background-color: #cccccc; font-family: verdana; font-size: medium;"><br /></span></p>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com1tag:blogger.com,1999:blog-6092039517214503377.post-72565482950734432332020-06-04T10:25:00.002-07:002020-06-06T13:54:14.955-07:00Nova Loop MagnéticaCinco anos depois da construção da antena Loop Magnética para levar para o campo, de uns quantos testes (porque, aqui, experimenta-se, eh eh) e com a chegada do "menino" mais novo (o YAESU FT-818ND) senti necessidade de uma antena para as minhas principais bandas de DX em QRP (80M, 60M, 40M, 20M e 17M).<br />
Como sabem, não uso sintonizadores de antena, trabalho com antenas ressonantes porque, principalmente, quando se trabalha com pequenas potências (QRP) todos os DB's contam e a inserção do sintonizador, ou outros, resulta em perdas na emissão.<br />
Como o meu sistema de tracção já não aguenta certos pisos (só posso andar "por bons caminhos"!) o volume ou o peso não são determinantes, vai na viatura. Importante, sim, é a rapidez a pôr a funcionar à beira de qualquer caminho.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtVdFtsTxAVCJ6U64ZMXa9URa0S4-joS-ibu_qMBj6iQlejTYnzF8HWyny5S03OjkMcAcCP1Z0o5u0I_9wFhPylfJ_ywmkfV6MDjtiPuGTj_GIg57Xg0JJJFOHRdGTZ_iVZ5eagZEMh48/s1600/antena+cond+desmult.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1296" data-original-width="1600" height="259" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtVdFtsTxAVCJ6U64ZMXa9URa0S4-joS-ibu_qMBj6iQlejTYnzF8HWyny5S03OjkMcAcCP1Z0o5u0I_9wFhPylfJ_ywmkfV6MDjtiPuGTj_GIg57Xg0JJJFOHRdGTZ_iVZ5eagZEMh48/s320/antena+cond+desmult.jpg" width="320" /></a></div>
<br />
<b>Material</b><br />
Então, a nova MAGLOOP, consta de:<br />
275cm de cabo coaxial Heliax (aro grande);<br />
56cm do mesmo cabo (aro pequeno);<br />
1 PL de chassis;<br />
15cm de tubo ou cantoneira em plástico;<br />
2 pontas de fio 10cm cada e<br />
1 condensador-variável (CV) de 350uF<br />
<i><b>e, o mais importante, "vontade" de meter as mãos na massa!</b></i><br />
<i><b><br /></b></i>
Aviso, desde já, para aqueles que não têm aquela habilidade a que chamam "tempo", que a dita está à venda, p.ex. na Wimo, por 545€+portes. Mas, não é a mesma coisa! Claro que não, esta é FMF (Fake Mas Funciona!) e o custo fica por duas ou três dezenas de Euros ou menos. Espreitem a vossa sucata.<br />
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<b>C</b><b>onstrução</b><br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh65zGT4n8KL5bUoDn7IhQ3SfYLB6h0FhkhxhuP7yEHePM2cDIOeJBmqXJdzqgDSynJq-gjTR8wUOBG7-jU9zgITw-QqYZq8KfGyifTgOGRoug7VYuZHTiEtNasXWfz2lqP6UtnTnLn8uE/s1600/IMG_20200605_182403.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1522" data-original-width="1143" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh65zGT4n8KL5bUoDn7IhQ3SfYLB6h0FhkhxhuP7yEHePM2cDIOeJBmqXJdzqgDSynJq-gjTR8wUOBG7-jU9zgITw-QqYZq8KfGyifTgOGRoug7VYuZHTiEtNasXWfz2lqP6UtnTnLn8uE/s200/IMG_20200605_182403.jpg" width="150" /></a><br />
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<br />
Em cada um dos lados do cabo de 275cm retire 1cm do plástico exterior. Com o ferro de soldar retire 0,5cm do dielétrico e dobre o condutor exterior até tocar o núcleo e estanhe. Solde as pontas de fio de 10cm.<br />
Faça um aro com os 275cm.<br />
<br />
Prenda as pontas com um tubo plástico (eu usei tubo verde de gás) ou cantoneira em plástico ou acrílico onde, préviamente faz dois furos para passar as pontas de fio que hão-de ligar ao condensador-variável.<br />
<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu6iqg0IJacX8kNBJJFRVTJBvx3tCplqxLL_T0mnCRe1LXbILlc2vt62jDSMgvT6QG73cJ_wD_OBh90jYzPAV3NLTGHHybaQCAbwOeRr-65wXMjvFzILwzU2uDwa9gmkba7aNxwRW0VwA/s1600/cantoneira.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="136" data-original-width="307" height="88" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu6iqg0IJacX8kNBJJFRVTJBvx3tCplqxLL_T0mnCRe1LXbILlc2vt62jDSMgvT6QG73cJ_wD_OBh90jYzPAV3NLTGHHybaQCAbwOeRr-65wXMjvFzILwzU2uDwa9gmkba7aNxwRW0VwA/s200/cantoneira.jpg" width="200" /></a>Melhor que a descrição é a imagem.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6a8MZSjmJfPTWKvNz6Y6Q9L9vSMH5xUOv_PU4kHHHZBvS0rb6VF5-0hbXtZ-riDPLi-K6w1XkApflynFompwxXqIp_NET6Q1nDLjezTR8wsMwbe2BagdqfxwiBgseaFLpGl-mVNJ7HQw/s1600/56_1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="554" data-original-width="1024" height="108" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6a8MZSjmJfPTWKvNz6Y6Q9L9vSMH5xUOv_PU4kHHHZBvS0rb6VF5-0hbXtZ-riDPLi-K6w1XkApflynFompwxXqIp_NET6Q1nDLjezTR8wsMwbe2BagdqfxwiBgseaFLpGl-mVNJ7HQw/s200/56_1.jpg" width="200" /></a><br />
Outra opção é cantoneira em plástico ou acrilico... ou outra.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh365gUiw36cM7yUMyKvOhnUqWYFuUF3ki4QkOE-xbkryBZbhx5hZ8q66mHDy5H5Qhjwtpc3KDCvhiqtoW_avwh1vUChz0JjKPRD1n9SyRoZrYOJL-d1pg250YVYW58oAzxXkddjJ-CPbQ/s1600/56cm.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="344" data-original-width="477" height="143" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh365gUiw36cM7yUMyKvOhnUqWYFuUF3ki4QkOE-xbkryBZbhx5hZ8q66mHDy5H5Qhjwtpc3KDCvhiqtoW_avwh1vUChz0JjKPRD1n9SyRoZrYOJL-d1pg250YVYW58oAzxXkddjJ-CPbQ/s200/56cm.jpg" width="200" /></a><br />
Molde o aro com a peça de 56cm, descarne o cabo e deixe as pontas (vivo e malha) separadas. Faça as ligações (crave ou solde terminais) à ficha, como indicado.<br />
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<b>Condensador-variável (CV)</b><br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXmhosLDmnzg77grQURiIh6G79woHf9Rjpl5LbNqaJ4eETe1-ba_1m6BgbonIhVhFYHt_zhMQdN39EPYgpTbVKLFarS-ANPryL5P_HjH7Z2M8jAFaOWI6GF8kmh_17JMPtcPZ4C3Ph0Ys/s1600/IMG_20200530_164156.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXmhosLDmnzg77grQURiIh6G79woHf9Rjpl5LbNqaJ4eETe1-ba_1m6BgbonIhVhFYHt_zhMQdN39EPYgpTbVKLFarS-ANPryL5P_HjH7Z2M8jAFaOWI6GF8kmh_17JMPtcPZ4C3Ph0Ys/s200/IMG_20200530_164156.jpg" width="150" /></a>Para conseguir um bom desempenho é determinante o valor do CV. Neste projeto utilizei, propositadamente 350uF para as bandas desejadas (17m aos 80m). Lembre-se de que quantos mais bandas pretender usar <u>maior</u> o compromisso com quebras de eficiência. Há ofertas dos 10 aos 160m... mas eu não quero!<br />
Tente arranjar um desmultiplicador para o condensador. A afinação é <i><b>muito fina</b></i>.<br />
A largura de banda utilizável é de cerca de 5khz o que, longe de ser um inconveniente, constitui uma grande vantagem pela rejeição comunicações em frequências adjacentes (fácilmente passa de S9 a S0).<br />
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<br />
<b>Montagem</b><br />
Simplesmente numa vara/tubo de 2m/2,5m de altura (tem de chegar ao condensador para ajustar/a não ser que monte um motor de passo para o controlar à distância).<br />
Eu usei 3 lanços mais largos de uma cana de fibra de vidro que me permite encolher para transporte e passar o cabo por dentro.<br />
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Resultados do teste:<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhk041-SMRdWjPJhLqMtPvYHwpmw9f1v8WKg-8aIOcfQ7j_8NAI4PbPTd8VzfoB0Z9Mpwx0rjIFql6zMjsEiJBEx_faJr23mDODyFlSIinNGkUJfNggfhxLSLe9E2NHsXO-H4d6JThsPEA/s1600/Medi%25C3%25A7%25C3%25B5es.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1486" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhk041-SMRdWjPJhLqMtPvYHwpmw9f1v8WKg-8aIOcfQ7j_8NAI4PbPTd8VzfoB0Z9Mpwx0rjIFql6zMjsEiJBEx_faJr23mDODyFlSIinNGkUJfNggfhxLSLe9E2NHsXO-H4d6JThsPEA/s400/Medi%25C3%25A7%25C3%25B5es.jpg" width="371" /></a></div>
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O ajuste inicial é feito pela distância entre o aro pequeno e o grande.</div>
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Fixe os aros com serrilha.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUQUGqUlly11JgtU5daqKFeO4Wdly-bsjsUJLqMj9_1R5gekP3M_-CVDGWrrHxVIs5UJsBpIJKSRyYf5prBFykqVRI2_JiMlLmcg8_jvYOGyLIji9WLhhVstO5Gh23EjcCqj64gI1uNK4/s1600/redimensionar.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="130" data-original-width="246" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUQUGqUlly11JgtU5daqKFeO4Wdly-bsjsUJLqMj9_1R5gekP3M_-CVDGWrrHxVIs5UJsBpIJKSRyYf5prBFykqVRI2_JiMlLmcg8_jvYOGyLIji9WLhhVstO5Gh23EjcCqj64gI1uNK4/s1600/redimensionar.jpg" /></a></div>
O condensador-variável poderá ser arrumado em caixa de montagem plástico.<br />
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Ontem foi dia de testes de receção:<br />
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dxy_rpRDlo5rgXCq6u8QqdRvrdd87q-OyWZk20RrR_XFcwzzwFBdLYPbDG3JK2axNffh0ssJUj_WeqfdPoagg' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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Para quem quiser saber mais, sobre a Loop Magnética há muita literatura na Internet (uns que estudaram e partilham conhecimentos e outros... a mandar bitaites...).<br />
<br />
Se quiser saber mais, recomendo este artigo de 113 páginas, sobre o assunto, escrito pelo colega Frank Dorenberg-N4SPP <<a href="https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop.htm">https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop.htm</a>><br />
<br />
<span style="color: red;"><b>Relembramos que esta antena, em emissão, gera tensões elevadas pelo que não deve ser tocada.</b></span><br />
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<b><span style="color: blue;">E boas comunicações!</span></b>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com4tag:blogger.com,1999:blog-6092039517214503377.post-83123323031447967462020-04-20T11:23:00.005-07:002021-03-20T05:16:05.954-07:00Antena 160mApós algum tempo de espera, devido às contingências do momento e devido ao meu grau de exigência, porque<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEcXBa9CUGqitzPQEG3Go7-BPpQRyZKx4oQySF1ni6CQgAdCpfv2tachkOnEpdWZ-R66go8lhrBv5l1pw723lAYSk1RD09O85h8Avk25pjgVcLdQACF09Oa2TRvnzwsFQXwDNqWS-YyP8/s1600/Fazer+mal....jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="89" data-original-width="509" height="55" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEcXBa9CUGqitzPQEG3Go7-BPpQRyZKx4oQySF1ni6CQgAdCpfv2tachkOnEpdWZ-R66go8lhrBv5l1pw723lAYSk1RD09O85h8Avk25pjgVcLdQACF09Oa2TRvnzwsFQXwDNqWS-YyP8/s320/Fazer+mal....jpg" width="320" /></a></div>
resolvi esperar pelo fio da Gallagher, construir e ajustar o transformador de impedância/UnUn de 2.200Ω para 50Ω, instalar, testar e ajustar o fio.<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJNTzLWXxi1itFZ8W4SUUSBNjb6zXZ6OjJr-9ImC2MMeA85m4-kSQU7cCn_PN5LTMO0O3SPlvBa5OKLy_A91_EEowwWoRj7YgGp2TL7xIodtzdQ5njzK0abqkeGH5ljYGPw6rZNtN9QI4/s1600/LongWire+160m_1.jpg" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="436" data-original-width="1183" height="233" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJNTzLWXxi1itFZ8W4SUUSBNjb6zXZ6OjJr-9ImC2MMeA85m4-kSQU7cCn_PN5LTMO0O3SPlvBa5OKLy_A91_EEowwWoRj7YgGp2TL7xIodtzdQ5njzK0abqkeGH5ljYGPw6rZNtN9QI4/s640/LongWire+160m_1.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">desenho sobre o local de instalação</td></tr>
</tbody></table>
O resultado está aqui:<br />
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='672' height='559' src='https://www.blogger.com/video.g?token=AD6v5dw3yKWAFM2V2y5szjWHUM1m51k0nrfkoe_4T39-ySDapBeaWUM74gR9lK8R75HEqe1WfLNoxVs3iDdzgL-20g' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://1drv.ms/v/s!AojfI3u8I-dk8AL8C13eZsNoqCkE?e=BbGhjT" target="_blank">ver vídeo ...</a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div>
Embora otimizada para os 1.845 KHz, a antena funciona sem compromisso nos 80m, 40m, 20m, 15m e 10m. Aqui não se usa sintonizador/antenna tuner... prefiro fios ressonantes!</div>
<div>
Em tempo de pandemia</div>
<div>
<img alt="Stay At Home Award | DX-World" height="135" src="https://www.dx-world.net/wp-content/uploads/2020/04/stay.png" width="135" /></div>
<div>
e siga o conselho da SRAL.</div>
<div>
<br /></div>
CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-50296918660488563722019-08-11T16:38:00.002-07:002019-08-12T04:18:10.116-07:00UnUn 64:1Embora, como sabem, eu não morra de amores por fios irradiantes, de comprimento aleatório, alimentados no extremo, vulgarmente designados por antenas EndFed não posso deixar de ajudar os amigos que necessitam de uma antena, fácil de transportar, para o campo.<br />
Como não dá para carregar nem um sintonizador/AT nem um analisador/medidor tivémos de incorporar no UnUn um comutador que permita modificar a relação necessária a permitir uma melhor performance nas bandas mais baixas e nas mais altas.<br />
Para obviar à falta de "terra" o contrapeso é feito pelo coaxial, cortado e ajustado.<br />
<br />
Aqui fica mais um exemplo, ajustado para a melhor relação em várias bandas, considerando a impedância do fio de 3K3Ohm<span style="font-family: "symbol"; font-size: 11pt;">.</span><br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6MNggJns1CG2wdcTZy3Of1UnRwEShJvZ_fOarW32ic3rMSNg4xXfktyE_HvA-_cNGIoK6fAvbfuQyBlmHg3R17Rdf4728IkTX3_VTQPJcos0Z3ayP2XpjRcCLHsIJHsn3RMkjvkHDfN4/s1600/IMG_20190731_101012.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1200" data-original-width="1600" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6MNggJns1CG2wdcTZy3Of1UnRwEShJvZ_fOarW32ic3rMSNg4xXfktyE_HvA-_cNGIoK6fAvbfuQyBlmHg3R17Rdf4728IkTX3_VTQPJcos0Z3ayP2XpjRcCLHsIJHsn3RMkjvkHDfN4/s320/IMG_20190731_101012.jpg" width="320" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh93leSpUVCJFXSbTKZ73D_wGA3PmJQX5UaeqipH_ck5_5HQozoiOyMqIBsCuPMYqq3oaktvjkZ2nXp7wMdCkQTUonKlnTwNIevAZNC3PUiOyMOGmWWw7lRrWlpM4WM9Kk9UcUhvzv459M/s1600/IMG_20190731_010743.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh93leSpUVCJFXSbTKZ73D_wGA3PmJQX5UaeqipH_ck5_5HQozoiOyMqIBsCuPMYqq3oaktvjkZ2nXp7wMdCkQTUonKlnTwNIevAZNC3PUiOyMOGmWWw7lRrWlpM4WM9Kk9UcUhvzv459M/s320/IMG_20190731_010743.jpg" width="240" /></a></div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqb6Od6HCiwEaUpCCXsSEhzmAdzC44Om-mW-tqH3ETM4mdOq_QLOPE2GusMWBYL5RPdo7mKMq0IMHJMWunNZTnDFMY_zZPOr-Th7D7CyqnoP7QhaTQTuv3D4an8qsrWM2fr3gDq7YW-5s/s1600/CR7ASP_IMG_20190731_010624.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqb6Od6HCiwEaUpCCXsSEhzmAdzC44Om-mW-tqH3ETM4mdOq_QLOPE2GusMWBYL5RPdo7mKMq0IMHJMWunNZTnDFMY_zZPOr-Th7D7CyqnoP7QhaTQTuv3D4an8qsrWM2fr3gDq7YW-5s/s400/CR7ASP_IMG_20190731_010624.jpg" width="300" /></a></div>
<br />
<span style="font-family: "symbol"; font-size: 11pt;"><br /></span>
<span style="font-family: "symbol"; font-size: 11pt;"><br /></span>
<br />
<span style="font-family: "symbol"; font-size: 11pt;"><br /></span>
<span style="font-family: "symbol"; font-size: 11pt;"><br /></span>
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;">Medida direta (aqui não se usam sintonizadores...) e simultânea às 6 bandas!</span></span><br />
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;"><br /></span></span>
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;">Haja "paciência"... e bom trabalho!</span></span><br />
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;"><br /></span></span>
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;">73 de</span></span><br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwDjjwg8s4o_9gxennkXX-K21RVvIytvVb9vb2gWuDX8C7uF9zdZYUY17YP1T9iIq5In3VSCzk28e2Y89-am6jHTZnuIz4XPWNMOQU7WNl2GKfZ6NNZzhlhBvZXw2j9joIA6w_oMPqklY/s1600/CT1BAT2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img alt="" border="0" data-original-height="500" data-original-width="400" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwDjjwg8s4o_9gxennkXX-K21RVvIytvVb9vb2gWuDX8C7uF9zdZYUY17YP1T9iIq5In3VSCzk28e2Y89-am6jHTZnuIz4XPWNMOQU7WNl2GKfZ6NNZzhlhBvZXw2j9joIA6w_oMPqklY/s200/CT1BAT2.jpg" title="" width="160" /></a><br />
<span style="font-size: 11pt;"><span style="font-family: "georgia" , "times new roman" , serif;"><br /></span></span>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-3511800113938520102019-05-05T03:46:00.005-07:002019-05-05T03:48:03.178-07:00ANTENNA END_FED ou ANTENA ALIMENTADA NO EXTREMO<br />
<div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: center;">
<div style="text-align: left;">
<span style="font-size: 12pt; text-align: justify;">Não sou fã de antenas alimentadas no
extremo, sejam elas de comprimento aleatório (<b>End_Fed</b>), de meia-onda (<b>EFHW</b>) ou
de fio longo (<b>LongWire</b> com 1 </span><span style="font-family: "symbol"; font-size: 12pt; text-align: justify;">l</span><span style="font-size: 12pt; text-align: justify;"> de comprimento) devido, fundamentalmente às suas caraterísticas (elevada
carga no extremo do fio), às condicionantes da instalação (necessidade de terra/de contrapeso, ângulo de instalação e distância em relação à terra, ...) aos
cuidados necessários para que a malha do coaxial não irradie, ao seu caráter ruidoso
e (muito importante!) à direcionalidade, quase, limitada ao sentido do fio.</span></div>
</div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12.0pt;">Para avaliar tudo isto e mais, são
necessários conhecimentos que, na generalidade, os amadores não têm e aparelhos
de medida adequados. </span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12pt;">Contudo, hoje, a Internet é um enorme poço
de conhecimento e experiências para quem quer saber mais ou, simplesmente, “o
porquê das coisas”. </span><i><span style="font-family: "georgia" , "times new roman" , serif;">Assim o espírito do radioamador os ilumine!</span></i></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<i><span style="font-family: "georgia" , "times new roman" , serif;"><br /></span></i></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt;">
<b style="mso-bidi-font-weight: normal;"><i style="mso-bidi-font-style: normal;"><span style="font-size: 12.0pt;">Contudo, alguns fins justificam os meios! <o:p></o:p></span></i></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt;">
<b style="mso-bidi-font-weight: normal;"><span style="font-size: 12.0pt;">- Descrição
simplificada do projeto</span></b><span style="font-size: 12.0pt;"><o:p></o:p></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12.0pt;">Queremos levar para o campo condições de
comunicação em 7023-7026khz e estamos limitados no peso a deslocar; não temos, nem tempo,
nem condições de instalação e afinação de antenas no local: apenas podemos transportar
um emissor QRP de CW, um rolo de fio e pouco mais; como usamos baixa potência
(0,8W) não podemos desperdiça-la com sintonizadores, medidores ou fichas e
outros adereços... temos de “casar” simplesmente o emissor com a antena e... rápidamente!<o:p></o:p></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjahhaQT97Gfnztg5NusOIPJAWI0zPoKotdrhcg7CxinLnd3pHWWBmx5DCyP6JvfL_XqLWMGED9s5XqRD3coVLpQEtQQ5ruPWi1yVmspC_pHh4KGBwAglOoSvoJSiK8nbCJpjZnPqyd0kk/s1600/fio.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="245" data-original-width="285" height="170" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjahhaQT97Gfnztg5NusOIPJAWI0zPoKotdrhcg7CxinLnd3pHWWBmx5DCyP6JvfL_XqLWMGED9s5XqRD3coVLpQEtQQ5ruPWi1yVmspC_pHh4KGBwAglOoSvoJSiK8nbCJpjZnPqyd0kk/s200/fio.jpg" width="200" /></a></div>
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr_TWNPh-WVxvy3AuUAzPPdVSIBoILRTBKSm7Nx9Lcc5vsfI9_9kPOkGd4G6SbleGbDnJSF858bd0mznVDSXmjObGIIj5qiug_8LDZQcOo4txSEgrLQRzGq6_FwvfprZ0cQmSl2aKaMYE/s1600/QRP+CW+transceiver.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="300" data-original-width="451" height="211" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr_TWNPh-WVxvy3AuUAzPPdVSIBoILRTBKSm7Nx9Lcc5vsfI9_9kPOkGd4G6SbleGbDnJSF858bd0mznVDSXmjObGIIj5qiug_8LDZQcOo4txSEgrLQRzGq6_FwvfprZ0cQmSl2aKaMYE/s320/QRP+CW+transceiver.jpg" width="320" /></a><br />
<div class="separator" style="clear: both; text-align: center;">
</div>
<span style="font-size: 12pt; text-align: justify;">Claro que necessitamos de algum material, como</span><br />
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
</div>
<ul>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">um coaxial para a baixada (da antena ao transcetor) e de </span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">um adaptador de impedância de 64:1, já que teremos no fio uma
impedância à volta dos 3 mil e tantos Ohm/</span><span style="font-family: "symbol"; font-size: 12.0pt;">W</span><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">
e 50</span><span style="font-family: "symbol"; font-size: 12.0pt;">W</span><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> no TRX.<o:p></o:p></span></li>
</ul>
<br />
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Não temos condições para a ligação à terra, nem do uso de
contrapeso (pedaço de fio em oposição à antena/ligado à malha) nem carregar com
sintonizadores de antena/antenna tuner (<i style="mso-bidi-font-style: normal;">não
tenho nem uso/trabalho com antenas ressonantes!</i>). <o:p></o:p></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<b style="mso-bidi-font-weight: normal;"><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Precisamos de
simplificar e, assim, teremos de levar feito e afinado.<o:p></o:p></span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Podemos comprar (bom e caro de fábrica ou montado por “comerciantes
de oportunidade” ou... meter as mãos na massa!)<o:p></o:p></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; text-align: justify;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Afinar somos <b><i>Radioamadores</i></b>: “...estudo, experimentação...”! Fica
bem mais barato e funciona: aprendemos e divertimo-nos a fazer.<o:p></o:p></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Aqui
fica a lista do material necessário:<o:p></o:p></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
</div>
<ol>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1 toroide 114-43;</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 2m de fio esmaltado 0,5mm</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1 condensador de 120pF 1000V</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1,20m de coaxial 50</span><span style="font-family: "symbol"; font-size: 12.0pt;"> W (</span><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">eu usei RG174)<o:p></o:p></span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1 parafuso com porca de orelhas;</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1 placa de acrílico/plástico e 4
cintas de serrilha;</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 1 ficha para ligar ao E/R e</span></li>
<li><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> 20,50m de fio (eu usei o que tinha:
0,5mm multifilar).</span></li>
</ol>
<br />
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><br /></span></div>
<div class="MsoNormal" style="text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr73Oh7fCJxkAATChUt0HtfJf-r-apgSvKupbtLAo0Ap0fJArO19kevZPnZyg92oDFX73WosrnAmofUOP3tHA3iKliDojPsKKlsskq7t_x5bSh25jldC8Eh-zFKOq1OZPlU3rF5UZ5M48/s1600/IMG_20190504_173852.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1142" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr73Oh7fCJxkAATChUt0HtfJf-r-apgSvKupbtLAo0Ap0fJArO19kevZPnZyg92oDFX73WosrnAmofUOP3tHA3iKliDojPsKKlsskq7t_x5bSh25jldC8Eh-zFKOq1OZPlU3rF5UZ5M48/s320/IMG_20190504_173852.jpg" width="228" /></a><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><o:p> </o:p></span><b><u><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Construção do transformador de
impedância</span></u></b></div>
<div class="MsoNormal" style="text-align: justify;">
<b style="mso-bidi-font-weight: normal;"><u><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><br /></span></u></b></div>
<div class="MsoListParagraphCxSpFirst" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">1.<span style="font: 7.0pt "Times New Roman";"> </span></span></span><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Dobre 10cm do
fio, sobre o restante e torça até que fiquem bem enrolados;<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">2.<span style="font: 7.0pt "Times New Roman";">
</span></span></span><!--[endif]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Dê 2 voltas da
parte entrançada no toroide. Deixe as 2 pontas e continue a enrolar, apenas, o
fio único até concluir 8 voltas (do fio único);<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">3.<span style="font: 7.0pt "Times New Roman";"> </span></span></span><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Encaminhe o fio
para o lado oposto do toroide e dê mais 8 voltas <u>ao contrário</u>;<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">4.<span style="font: 7.0pt "Times New Roman";">
</span></span></span><!--[endif]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">A ponta do fio
prenda/ligue ao parafuso.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-list: Ignore;">5.<span style="font: 7.0pt "Times New Roman";"> </span></span></span><span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">As pontas que
deixou no inicio ligue, a entrançada ao vivo do coaxial e a ponta de fio único
à malha.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="mso-list: l0 level1 lfo1; text-align: justify; text-indent: -18.0pt;">
<span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"> Solde (uma ficha é mais "perdas" a somar!)</span></div>
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<br /></div>
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<span style="font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">A
“apresentação” é a gosto! (chapa de acrílico/caixa bonitinha/ lata da graxa... tem
muitas ideias na Internet)<o:p></o:p></span></div>
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<br /></div>
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Vamos afinar...</div>
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<o:p></o:p></div>
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<br /></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1-kLy1krjkYPBvuvAh9gNu2u_AwFHBRZUW-3w-ekLZmcJFcHTJTz2sqhTPm6KB4MuFKQBAiSX62q7T0nzuxA-jXGFqIpzjJWwXbVD_PoRaoAAm0071nGPZEhWQ0Fzwdxe3DbMhe-o9_g/s1600/IMG_20190504_173951.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1-kLy1krjkYPBvuvAh9gNu2u_AwFHBRZUW-3w-ekLZmcJFcHTJTz2sqhTPm6KB4MuFKQBAiSX62q7T0nzuxA-jXGFqIpzjJWwXbVD_PoRaoAAm0071nGPZEhWQ0Fzwdxe3DbMhe-o9_g/s200/IMG_20190504_173951.jpg" width="150" /></a>Pendure o transformador a 2m de altura (para que o cabo
desça, na vertical, ao transcetor) afastado de obstáculos (prenda com uma corda
para um lado, antena para outro cf. imagem). Prenda a outra extremidade do fio
(antena) com uma corda para poder baixar/subir. <o:p></o:p></div>
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<br /></div>
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Esteja ciente de que a variação, em altura, influi na ROE
(proximidade da terra/obstáculos <span style="mso-spacerun: yes;"> </span>e no
ângulo de fogo/direcionalidade (eu deixei a 5m de altura, em terra=experiência
de “outras batalhas”). A afinação é feita no comprimento do fio/antena
(encurtando).<o:p></o:p></div>
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<br /></div>
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<o:p><br /></o:p></div>
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O resultado?!?<o:p></o:p></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh80TLG6aDNMaDhVspR9cI0MKW8QgVBAGs8xkv8UM5B8LawmXxvR8VrJoBYRg5Dr_S_u9lIeOLviF_YZfP47o6FaREIBnl6FnaL2YgyUyPg49kV_4wDYfvdqbEQf9oz4lgQ8qz2aTJ3HLA/s1600/IMG_20190504_173822.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh80TLG6aDNMaDhVspR9cI0MKW8QgVBAGs8xkv8UM5B8LawmXxvR8VrJoBYRg5Dr_S_u9lIeOLviF_YZfP47o6FaREIBnl6FnaL2YgyUyPg49kV_4wDYfvdqbEQf9oz4lgQ8qz2aTJ3HLA/s320/IMG_20190504_173822.jpg" width="240" /></a></div>
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<span style="mso-fareast-language: PT; mso-no-proof: yes;"><!--[if gte vml 1]><v:shape
id="Imagem_x0020_2" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:356.25pt;
height:474.75pt;visibility:visible;mso-wrap-style:square'>
<v:imagedata src="file:///C:\Users\JOSE\AppData\Local\Temp\msohtmlclip1\01\clip_image005.jpg"
o:title=""/>
</v:shape><![endif]--><!--[if !vml]--><!--[endif]--></span><o:p></o:p></div>
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Note que:<o:p></o:p></div>
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- este resultado corresponde às medidas indicadas. Se optar
por outro material (toroide/secção de fio/comprimento ou tipo de coaxial, ...)
o resultado será diferente.<o:p></o:p></div>
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- <span style="mso-spacerun: yes;"> </span><u>a mesma antena
não funciona exatamente igual em dois lugares diferentes</u> devido às
condições de instalação, mas... andará lá próximo!<o:p></o:p></div>
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<br /></div>
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<b style="mso-bidi-font-weight: normal;"><i style="mso-bidi-font-style: normal;">Assim, é só chegar ao campo, prender as duas pontas e... <span style="mso-spacerun: yes;"> </span>emissor no ar!<o:p></o:p></i></b></div>
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<b style="mso-bidi-font-weight: normal;"><i style="mso-bidi-font-style: normal;"><br /></i></b></div>
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O custo?!? – Insignificante! O preço de um toroide (3/5€ no
eBay) e um retalho de fio da sucata!<o:p></o:p></div>
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<br /></div>
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<br /></div>
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<b><i><br /></i></b></div>
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<b><i>Mãos à obra e... divirtam-se!</i></b><o:p></o:p></div>
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<br /></div>
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<i><span style="font-size: 12pt;">73 from</span></i></div>
<br />
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<b><span style="font-size: 12pt;"> José Machado</span></b></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjR62yN7-HUoLmEkT_y-BDqNE23KtbqGkvsHvzSvEuZSdIkoSYtJswFJw7zyWKrDtuJi7SpyciqfAgtVHncgQi7wSydpr_YxksP9xkLtD0WHwthlfVjmaX4flh-TjnCIK7HhhVw4CGV0BY/s1600/ct1bat.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="500" data-original-width="400" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjR62yN7-HUoLmEkT_y-BDqNE23KtbqGkvsHvzSvEuZSdIkoSYtJswFJw7zyWKrDtuJi7SpyciqfAgtVHncgQi7wSydpr_YxksP9xkLtD0WHwthlfVjmaX4flh-TjnCIK7HhhVw4CGV0BY/s200/ct1bat.jpg" width="160" /></a></div>
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<br />CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-42081546541903012572019-03-12T13:57:00.001-07:002019-03-12T13:57:27.512-07:00Es'hail2: Antena para 2.4GHz<span style="background-color: white; color: #1d2129; font-family: Helvetica, Arial, sans-serif; font-size: 14px;">Comentava, há dias, um colega radioamador (militante!) que desde o aparecimento do <b>hail2</b> o preço das antenas disparou, os stocks na UE esgotaram e os preços ultrapassaram os limites do concebível.</span><br style="background-color: white; color: #1d2129; font-family: Helvetica, Arial, sans-serif; font-size: 14px;" /><span style="background-color: white; color: #1d2129; font-family: Helvetica, Arial, sans-serif; font-size: 14px;">Foi um desafio e proporcionou-me uma tarde "bem passada", com recurso à sucata e onde o gozo da construção/afinação foi (muito!) maior que o custo do material (insignificante...).</span><br />
Disco: 14cm<br />
Comprimento: 14,37cm<br />
Ganho: 10,27dBi<br style="background-color: white;" /><span style="color: #1d2129; font-family: Helvetica, Arial, sans-serif;"><span style="background-color: white; font-size: 14px;">Calculadora recomendada: </span><span style="font-size: 14px;">http://jcoppens.com/ant/helix/calc.en.php </span></span><br />
<span style="background-color: white; color: #1d2129; font-family: Helvetica, Arial, sans-serif; font-size: 14px;">Disponham.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmxflPyQ6HGI9YDHnvzdQ4oebEKcjWnKflEgFMJYyuqvM28sbK9URCRQa08BbZfJG3cBZ-hYejpkxMxOBhQrMdGyCNsFxOQFLarvL5y9GISFeMX0nXdFRXP9c4mwGfdyMw_vM_yFt8pcE/s1600/IMG_20190312_1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmxflPyQ6HGI9YDHnvzdQ4oebEKcjWnKflEgFMJYyuqvM28sbK9URCRQa08BbZfJG3cBZ-hYejpkxMxOBhQrMdGyCNsFxOQFLarvL5y9GISFeMX0nXdFRXP9c4mwGfdyMw_vM_yFt8pcE/s320/IMG_20190312_1.jpg" width="240" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS-GHL9q2XHcJlyGzEQdwQ8PFdfARmUrb5QarqckLLuw7ergFM3_xUjYBuvND57-jPzHDGaZUXPBH8sWbyP6e6HGDWSrg1qKvaOCzNUAYF70JFlsKYQEMv3y5rsEyE5TadLGeJmCj0HsM/s1600/IMG_20190312_2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS-GHL9q2XHcJlyGzEQdwQ8PFdfARmUrb5QarqckLLuw7ergFM3_xUjYBuvND57-jPzHDGaZUXPBH8sWbyP6e6HGDWSrg1qKvaOCzNUAYF70JFlsKYQEMv3y5rsEyE5TadLGeJmCj0HsM/s640/IMG_20190312_2.jpg" width="480" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBW56juIxeKFauyCLYODa_qKAOcRg5gZgFF4pzqeNB9vVVxmcLDLwKevzNMI6TDt-rVgmXJupAS17EWfNrk-3rgs5Sb6rxA46YqQ5KyugWMMrTckozHc8kMZmY9wUjgR1XXBoWhuzCm6g/s1600/IMG_20190312_3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1200" data-original-width="1600" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBW56juIxeKFauyCLYODa_qKAOcRg5gZgFF4pzqeNB9vVVxmcLDLwKevzNMI6TDt-rVgmXJupAS17EWfNrk-3rgs5Sb6rxA46YqQ5KyugWMMrTckozHc8kMZmY9wUjgR1XXBoWhuzCm6g/s320/IMG_20190312_3.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3tiMc_r9Ld7S7eRU65hWRXirJN6yywf_kuE-pNF6WElK00MdgY2W_7EFKBL1unRm4EWwxs_fg6nHg4PJ-xeOhF7bVNMY_DKfb8BqQQO-k_lttB7P2O9cMsSYuPbPO0JUQ0DCIuAV1QpA/s1600/IMG_20190312_4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3tiMc_r9Ld7S7eRU65hWRXirJN6yywf_kuE-pNF6WElK00MdgY2W_7EFKBL1unRm4EWwxs_fg6nHg4PJ-xeOhF7bVNMY_DKfb8BqQQO-k_lttB7P2O9cMsSYuPbPO0JUQ0DCIuAV1QpA/s640/IMG_20190312_4.jpg" width="480" /></a></div>
<span style="background-color: white; color: #1d2129; font-family: Helvetica, Arial, sans-serif; font-size: 14px;"><br /></span>CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-5775424433725607072018-12-13T15:05:00.000-08:002018-12-13T15:05:29.464-08:00Novo mastro em CT1BATA fim de melhorar as condições de E/R nas bandas de 2m, 4m, 70cm, 1,2GHz, 2,4GHz e 5GHz projetei um mastro, auto-sustentado, com carro elevatório.<br />
Feitos os planos, o que pensava ser fácil (tipo, justar e pagar) valeram-me alguns dias de companhia ao serralheiro, marca aqui/solda ali, Lol. Mas foi uma experiência enriquecedora!<br />
E chegou o dia da coisa ir para o ar... 9 metros de tubo galvanizado 100x100, 3mm de parede, mas... a grua não passava debaixo da varanda por... 8cm!!! Valeram os amigos e a experiência do Sr Franklim: "- Toda a gente aqui a levantar e NINGUÉM PÁRA". Apoiado nos primeiros dois parafusos chumbados num bloco de 1 metro cúbico de betão, o mastro começa a levantar (NINGUÉM PÁRA grita o Franklim!) e, quando chega à vertical (agora devagar...) e [TRAK] o mastro encaixa nos oito parafusos!<br />
Depois foi uma semana de montagens, substituir cabos, afinações do motor, carrinho, rotor, estação meteorológica, caixa de chegada, terras e comutadores, câmara de video e algumas antenas (as de competição hão-de vir da Serbia!).<br />
E, assim,nos vamos divertindo!<br />
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dzig4xU9SicXayZQOZAruFMB33Pn05DV5D6EextqQPBt6WD1OjXrn7TDKEhSDag2dFBVdcbEo49XaPUvPRwqg' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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<br />CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com0tag:blogger.com,1999:blog-6092039517214503377.post-63207228503536941092018-10-24T09:03:00.002-07:002018-10-24T09:07:14.377-07:00Bobines: como medir a frequência de ressonância com um analisador?Normalmente os analisadores não trazem as bobines necessárias à medição da frequência de ressonância das bobines/traps. Algumas marcas têm, mas custo dinheiro.<br />
O Gid Dip Meter ou dipímetro, tão útil a quem trabalha com antenas ou linhas de transmissão é considerado, por muitos, como que um instrumento em desuso!<br />
Ao trabalho.<br />
Tem um medidor e precisa conhecer a frequência de ressonância de um trap/bobine para a antena que está a construir?<br />
Mãos à obra.<br />
Material: 1 PL259 ou N + 1 tubo de plástico 0,8mm+ 1/2 metro de fio 0,5mm<br />
Descrição (ver imagem<span style="text-align: center;">)</span> : Enrole 10 voltas de fio no tubo, deixe uma ponta para soldar à massa e, a outra, passe por dentro do tubo e solde ao vivo da ficha.<br />
Tempo de execução: 5 minutos<br />
Custo: 2€ (1 ficha<span style="text-align: center;">)</span><br />
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dx0V6Hpdw0Ebke1KJ12b7lYNAN10u28QcZMm1_DyxGm6zFwOP15Vqm-QeXFzq3Lp6kvlQGgUy98I4xycuYwEw' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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Agora, só falta medir:</div>
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<br /><iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dyqcE74Sb_0QaUot7DSVr2F-d0MLRC34wSM0I8HPvkrAh7A6EBUv8kt5o4fjkhVnKxxZ0yGK3V7nlhQCUC7' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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Fácil e barato!</div>
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Bom trabalho e afine as suas antenas, não deixe esse trabalho para o Antenna Tuner que, esse, paga-se em potência.</div>
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<br />CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com4tag:blogger.com,1999:blog-6092039517214503377.post-35688500270396322482018-01-18T11:16:00.003-08:002018-01-18T11:16:54.852-08:00Manutenção das antenasAs antenas, os transformadores de impedância e as linhas de transmissão precisam de verificação das condições de funcionamento e manutenção. Os materiais, também, se degradam.<br />
Hoje, foi a vez da Loop de quadro de HF:<br />
- antena, check!<br />
- Cabo/Linha: check!<br />
- Balun 4:1: not check.<br />
Abrir, desmontar, limpar e refazer. Ajustar e montar de novo.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe6XJNgALjE2anDX9Tcws2yGDH-jWjDkdMk4_DdrgGiGzzwyWq8FHqhdTTIiT2VpuwhRb8GZXGP_Ui0TkGDKJoswmwIX7JKGVRQbB1BA9VPC4RQXDQbYFsO9O1xz0-GPPPPQsJLhCFC1M/s1600/IMG_20180118_162805.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe6XJNgALjE2anDX9Tcws2yGDH-jWjDkdMk4_DdrgGiGzzwyWq8FHqhdTTIiT2VpuwhRb8GZXGP_Ui0TkGDKJoswmwIX7JKGVRQbB1BA9VPC4RQXDQbYFsO9O1xz0-GPPPPQsJLhCFC1M/s400/IMG_20180118_162805.jpg" width="300" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVVqpwUHJZM4rXhgaDtB-LRInFr0SLYfJCDmC6ncypMh6Qks1vQtTKeLZX7ezghYXj8Jleb7O1rtk-LuEznKUDBWwxC3O6M9S3Ck9JByf6qVv2Z-fI7HnDj0oHdWzUs_Jxiqu9JGs2zIQ/s1600/IMG_20180118_162152.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1200" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVVqpwUHJZM4rXhgaDtB-LRInFr0SLYfJCDmC6ncypMh6Qks1vQtTKeLZX7ezghYXj8Jleb7O1rtk-LuEznKUDBWwxC3O6M9S3Ck9JByf6qVv2Z-fI7HnDj0oHdWzUs_Jxiqu9JGs2zIQ/s400/IMG_20180118_162152.jpg" width="300" /></a></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdjaEfEClOFN6XesI2ImkZiyBptHtVcZcmqL_JtYPFqySqkgNBm4PnnLi_r_b31SsmvsaWMNN4ZPuxL-f8eTNmB9mxG-PGTamOgs2-TJyxM-JytI2c-jouAx96HicFUT3NaIW5u0aK8Js/s1600/IMG_20180118_162140.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1600" data-original-width="1200" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdjaEfEClOFN6XesI2ImkZiyBptHtVcZcmqL_JtYPFqySqkgNBm4PnnLi_r_b31SsmvsaWMNN4ZPuxL-f8eTNmB9mxG-PGTamOgs2-TJyxM-JytI2c-jouAx96HicFUT3NaIW5u0aK8Js/s400/IMG_20180118_162140.jpg" width="300" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">inclusive WARC (tudo abaixo de 1.1.1 SEM sintonizador)</td></tr>
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Não uso sintonizador/acoplador/tuner... Trabalho com antenas ressonantes afinadas!</div>
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Montado e, de novo, a funcionar!</div>
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<br />CT1BAThttp://www.blogger.com/profile/09826678259425533722noreply@blogger.com2