<div dir="ltr">:) Colega José CT1BAT eu sabia que nos arquivos da sabedoria haveria algo!<div><br></div><div>A única consideração que tenho é "Maximum voltage: 100V d.c.", o MFJ qrp loop tuner diz que vai ate 25W ...</div><div><br></div><div>Estamos no bom caminho!</div><div><br></div><div>O tuner que o Colega CT1BAT construiu está melhor do que a versão comercial ;)</div><div><br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br><br>73 de Luis, CT2FZI</div><div><br></div><div style="text-align:left"><a href="http://www.ct2fzi.net" target="_blank">http://www.ct2fzi.net</a></div><div><div style="text-align:center"><a href="http://goog_717545661" target="_blank"><br></a></div><div style="text-align:left"><a href="http://www.ct2fzi.net" target="_blank"><img src="http://www.qsl.net/ct2fzi/images/header1a.jpg" width="420" height="37" style="font-size:12.8px"></a></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On 18 March 2016 at 16:44, José Machado <span dir="ltr"><<a href="mailto:ct1bat@gmail.com" target="_blank">ct1bat@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="PT" link="blue" vlink="purple"><div><div><div><div><div><div><div><div><p class="MsoNormal"><b><span style="color:#1f497d">Olá Luis,<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-family:"Calibri","sans-serif";color:#1f497d">este produto usa estes<u></u><u></u></span></b></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-size:18.0pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">Polyvaricon, 266pF X 2 and 20pF X 2, Dual Gang AM/FM Variable Capacitor<br><br></span></b><span style="font-size:13.5pt;font-family:"Arial","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">This is one item<span> </span>of new variable capacitor<span> </span>comprising two 266pF AM sections and two 20pF FM sections. All the sections can be connected together if required to create 572pF in total for receiving loop antennas or for a crystal set tuning capacitor which calls up 500pF. The matching 266pF sections allow use in low power Z-match type antenna matching circuits.<span> </span></span><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><br><br></span><span style="font-size:13.5pt;font-family:"Arial","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">Two M2.5 screws are included for panel mounting along with two loose nuts which allow for spacing behind thin panels. The mounting screws must not go into the body too far or the FM capacitor sections will be damaged. There is also a shaft extension included which is secured onto the shaft with another M2.5 bolt. This is a simple 6mm diameter polystyrene spacer which works really well as a shaft extension and allows the use of standard grub screw knobs<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><br></span><span style="font-size:13.5pt;font-family:"Arial","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">The trimmer capacitors C1 to C4 on the rear measure about 15pF maximum. These C1 and C2 are internally connected across the two FM sections but C3 and C4 have separate external connections rather than internal connections to the AM sections. All the connections have long, easy to solder tabs or they can even be connected without soldering using 2A terminal block connectors. Connection diagrams are shown below.</span><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><br><br></span><a href="http://www.usefulcomponents.com/ebay/pictures/capacitors/vc_plastic/pvcon_266pf/pvcon_conn_fm_txt_s.jpg" target="_blank"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#0654ba;border:none windowtext 1.0pt;padding:0cm;background:gainsboro;text-decoration:none"><img border="0" width="314" height="255" src="cid:image007.jpg@01D18135.60FC91F0" alt="266pF X 2 connection diagram"></span></a><a href="http://www.usefulcomponents.com/ebay/pictures/capacitors/vc_plastic/pvcon_266pf/pvcon_conn_am_txt_s.jpg" target="_blank"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#0654ba;border:none windowtext 1.0pt;padding:0cm;background:gainsboro;text-decoration:none"><img border="0" width="299" height="255" src="cid:image008.jpg@01D18135.60FC91F0" alt="Dual gang equal value section polyvaricon"></span></a><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><br><br></span><u><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">Connection Diagram Key</span></u><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><br><br>A Common (GND)<br>B VC1, 20pF + C1 15pF trimmer, FM<br>C Common (GND)<br>D <span> </span>VC2, 20pF + C2 15pF trimmer, FM</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black"><br></span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">E VC4, 266pF, AM<br>F VC3, 266pF, AM<br>G C4, 15pF trimmer<br>H Common (GND)<br>I C3, 15pF trimmer<br><br><u>Headline Specs</u><br><br>Maximum voltage: 100V d.c.<br>Mounting bolts: M2.5, 6mm length provided<br>Mounting bolt separation: 14mm<br>Shaft securing bolt: M2.5, 15mm length provided<br>Overall box dimensions: 22 x 22 x 17mm<br>Height inc shaft: 21mm<br>Shaft length: 4mm normal, 16.5mm with extension<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><u></u> <u></u></span></p><div style="border-top:solid windowtext 1.0pt;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;padding:1.0pt 0cm 1.0pt 0cm"><p class="MsoNormal" style="border:none;padding:0cm"><b><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"> À venda no ebay</span></b><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"> </span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><a href="http://www.ebay.co.uk/itm/Polyvaricon-266pF-X-2-and-20pF-X-2-Dual-Gang-AM-FM-Variable-Capacitor-/111549349627?hash=item19f8dbfefb:g:MAcAAOSwAL9UjvOb" target="_blank">http://www.ebay.co.uk/itm/Polyvaricon-266pF-X-2-and-20pF-X-2-Dual-Gang-AM-FM-Variable-Capacitor-/111549349627?hash=item19f8dbfefb:g:MAcAAOSwAL9UjvOb</a> <u></u><u></u></span></p></div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro">Esta é a minha construção (à volta de €60)<u></u><u></u></span></b></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1f497d;border:none windowtext 1.0pt;padding:0cm;background:gainsboro"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><img border="0" width="514" height="386" src="cid:image009.jpg@01D18135.60FC91F0"></span><span style="font-family:"Calibri","sans-serif";color:#1f497d">$<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-family:"Calibri","sans-serif";color:#1f497d">deste comercial ($99 nos states)<u></u><u></u></span></b></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><img border="0" width="685" height="385" src="cid:image010.jpg@01D18135.60FC91F0"></span><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-family:"Calibri","sans-serif";color:#1f497d">Este é o esquema (repara nos condensador Poly 266pF!)<u></u><u></u></span></b></p><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1f497d"><img border="0" width="1022" height="484" src="cid:image011.jpg@01D18135.60FC91F0"></span><span style="font-family:"Calibri","sans-serif";color:#1f497d"><u></u><u></u></span></p><span class=""><div><p class="MsoNormal">2016-03-18 11:50 GMT+00:00 CT2FZI IM58kr <<a href="mailto:ct2fzi@gmail.com" target="_blank">ct2fzi@gmail.com</a>>:<u></u><u></u></p><div><div><div><p class="MsoNormal">Viva,<u></u><u></u></p><div><p class="MsoNormal"><br>Algum dos colegas tem um esquema/diagrama/valores dos condensadores para fazer algo do genero deste produto comercial?<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><img border="0" width="518" height="545" src="cid:image012.png@01D18135.60FC91F0" alt="Inline images 1"><u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Basicamente fuciona - dependendo do comprimento do loop - entre os 40 e 10m, com 75% de 1/4 de onda da frequencia que queremos trabalhar.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Tirando algumas consideracoes mecanicas e os valores/tipos dos condensadores nao vejo nada complicado de reproduzir...<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">CT1BAT, havera alguma coisa aí no arquivo?<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Obrigado!<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><br clear="all"><u></u><u></u></p><div><div><div><div><div><div><div><div><div><div><p class="MsoNormal"><br><br>73 de Luis, CT2FZI<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><p class="MsoNormal"><a href="http://www.ct2fzi.net" target="_blank">http://www.ct2fzi.net</a><u></u><u></u></p><div><p class="MsoNormal" align="center" style="text-align:center"><a href="http://goog_717545661" target="_blank"><br></a> <u></u><u></u></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></span></div></div></div></div></div></div><p class="MsoNormal"><u></u> <u></u></p></div></div>
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