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</o:shapelayout></xml><![endif]--></head><body lang=PT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Boa noite colegas,<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Já pus mãos á obra e já fiz o comutador de antenas que tinha na ideia! Utilizando 2 relés normais de 12v, com 4 contactos duplos cada 1 (NC e NO), consegui fazer a comutação de 4 antenas para 1 cabo coaxial evitando assim ter que sair de casa cada vez que quero mudar de antena. Usei uma simplíssima base de regras booleanas, usado também em electrónica digital e com esta tabela consigo facilmente seleccionar a antena que quero:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 align=left style='border-collapse:collapse;margin-left:4.8pt;margin-right:4.8pt'><tr><td width=199 valign=top style='width:149.6pt;border:solid black 1.0pt;border-bottom:solid black 2.25pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Switch 1<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 2.25pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Switch 2<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 2.25pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Antena<o:p></o:p></span></b></p></td></tr><tr><td width=199 valign=top style='width:149.6pt;border:solid black 1.0pt;border-top:none;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>0<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>0<o:p></o:p></span></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>1<o:p></o:p></span></p></td></tr><tr><td width=199 valign=top style='width:149.6pt;border:solid black 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>0<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>1<o:p></o:p></span></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>2<o:p></o:p></span></p></td></tr><tr><td width=199 valign=top style='width:149.6pt;border:solid black 1.0pt;border-top:none;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>1<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>0<o:p></o:p></span></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;background:silver;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>3<o:p></o:p></span></p></td></tr><tr><td width=199 valign=top style='width:149.6pt;border:solid black 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>1<o:p></o:p></span></b></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>1<o:p></o:p></span></p></td><td width=200 valign=top style='width:149.65pt;border-top:none;border-left:none;border-bottom:solid black 1.0pt;border-right:solid black 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'><p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>4<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Durante a construção, usei uma fita de alumínio com cola (usada para fazer as uniões dos esquentadores aos tubos de exaustão) para fazer uma blindagem aos relés, como poderão ver na imagem.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Em anexo seguem umas fotos do trabalho, que não é nada de especial nem está com grande apresentação mas que poderá servir para desenrascar algum colega tal como me está a desenrascar a mim! Não consigo anexar o esquema pois foi feito á mão e não tenho scanner… Talvez quando for oportuno compre um comutador de antenas, algo específico para o assunto pois certamente terá menos perdas de inserção!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Bom, aqui fica este pequeno trabalhinho,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Os meus cumprimentos 73<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Pedro Madeira CT2JQB<o:p></o:p></span></p></div></body></html>