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Colega Gomes<BR>
<BR>
Está a perguntar sobre os condençadores de RF, mas isso é um pouco vago.<BR>
Presumo que sejam condençadores de acoplamento.<BR>
Factores importantes são: a corrente, a temperatura e o isolamento.<BR>
Para alta tensão, tipo placas das Valvulas, normamente usam-se condençadores de disco, ceramicos.<BR>
<BR>
<A href="http://images.google.com/imgres?imgurl=http://www.foxtango.org/amplifiers/graphics/Cracked%2520Ceramic%2520Caps.jpg&imgrefurl=http://www.foxtango.org/amplifiers/FL%2520Amplifier%2520Evolution.htm&h=480&w=640&sz=34&hl=pt-BR&start=29&um=1&tbnid=mDOia4QLGhalRM:&tbnh=103&tbnw=137&prev=/images%3Fq%3Dcapacitors%2BHV%26start%3D20%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=103 src="http://tbn0.google.com/images?q=tbn:mDOia4QLGhalRM:http://www.foxtango.org/amplifiers/graphics/Cracked%2520Ceramic%2520Caps.jpg" width=137></A> ou <A href="http://images.google.com/imgres?imgurl=http://www.genvolt.co.uk/pictures/ceramic.jpg&imgrefurl=http://www.genvolt.co.uk/index.php%3Fpage%3Dallproducts%26sec%3D15&h=500&w=500&sz=24&hl=pt-BR&start=35&um=1&tbnid=al4-j3dVhESmwM:&tbnh=130&tbnw=130&prev=/images%3Fq%3Dcapacitors%2BHV%26start%3D20%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=130 src="http://tbn0.google.com/images?q=tbn:al4-j3dVhESmwM:http://www.genvolt.co.uk/pictures/ceramic.jpg" width=130></A> <A href="http://images.google.com/imgres?imgurl=http://www.chinavendors.com/upload/cvo/product/super-high-voltage-ceramic-capacitors-0000035725-S.jpg&imgrefurl=http://www.b2bchinasources.com/China-Manufacturers-13829/Ceramic-Capacitors.html&h=80&w=80&sz=3&hl=pt-BR&start=100&um=1&tbnid=f1hUJ0uqP7ReYM:&tbnh=74&tbnw=74&prev=/images%3Fq%3Dhi%2Bq%2Bcapacitors%2BHV%2B%26start%3D80%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; WIDTH: 106px; BORDER-BOTTOM: 1px solid; HEIGHT: 108px" height=74 src="http://tbn0.google.com/images?q=tbn:f1hUJ0uqP7ReYM:http://www.chinavendors.com/upload/cvo/product/super-high-voltage-ceramic-capacitors-0000035725-S.jpg" width=74></A><A href="http://images.google.com/imgres?imgurl=http://www.foxtango.org/amplifiers/graphics/Cracked%2520Ceramic%2520Caps.jpg&imgrefurl=http://www.foxtango.org/amplifiers/FL%2520Amplifier%2520Evolution.htm&h=480&w=640&sz=34&hl=pt-BR&start=29&um=1&tbnid=mDOia4QLGhalRM:&tbnh=103&tbnw=137&prev=/images%3Fq%3Dcapacitors%2BHV%26start%3D20%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"></A><A href="http://images.google.com/imgres?imgurl=http://www.foxtango.org/amplifiers/graphics/Cracked%2520Ceramic%2520Caps.jpg&imgrefurl=http://www.foxtango.org/amplifiers/FL%2520Amplifier%2520Evolution.htm&h=480&w=640&sz=34&hl=pt-BR&start=29&um=1&tbnid=mDOia4QLGhalRM:&tbnh=103&tbnw=137&prev=/images%3Fq%3Dcapacitors%2BHV%26start%3D20%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"></A><BR>
<BR>
de tensão de isolamento 20KV e 1000pf de capacidade.<BR>
Para circuitos de baixa impedancia, amplificadores transitorisados , filtros de antena, ou sintonizadores, usam-se condensadores de Mica, pois suportam melhor o RF sob altas correntes.<BR>
<BR>
<A href="http://images.google.com/imgres?imgurl=http://www.iclcapacitores.com.br/images/prata.jpg&imgrefurl=http://www.iclcapacitores.com.br/produtos.html&h=190&w=230&sz=9&hl=pt-BR&start=28&um=1&tbnid=6sRa0Jj1w8rqKM:&tbnh=89&tbnw=108&prev=/images%3Fq%3Dcapacitors%2Bmica%26start%3D20%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=89 src="http://tbn0.google.com/images?q=tbn:6sRa0Jj1w8rqKM:http://www.iclcapacitores.com.br/images/prata.jpg" width=108></A> ou <A href="http://images.google.com/imgres?imgurl=http://jimmyauw.com/wp-datajim/audio/53_mica.jpg&imgrefurl=http://jimmyauw.com/2006/09/14/my-high-quality-audio-grade-components/&h=264&w=450&sz=27&hl=pt-BR&start=68&um=1&tbnid=pZ-LrdS2sIxLCM:&tbnh=75&tbnw=127&prev=/images%3Fq%3Dcapacitors%2Bmica%26start%3D60%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=75 src="http://tbn0.google.com/images?q=tbn:pZ-LrdS2sIxLCM:http://jimmyauw.com/wp-datajim/audio/53_mica.jpg" width=127></A> <A href="http://images.google.com/imgres?imgurl=http://img.alibaba.com/images/cms/content/135x135_080222_capacitors_3.jpg&imgrefurl=http://www.alibaba.com/activities/features/capacitors.html&h=135&w=135&sz=3&hl=pt-BR&start=49&um=1&tbnid=jgmEtE6NOsR_9M:&tbnh=92&tbnw=92&prev=/images%3Fq%3Dcapacitors%2Bvariable%2B%2Bmica%26start%3D40%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=92 src="http://tbn0.google.com/images?q=tbn:jgmEtE6NOsR_9M:http://img.alibaba.com/images/cms/content/135x135_080222_capacitors_3.jpg" width=92></A><BR><BR>
Os condensadores variaveis de Mica tambem são de grande qualidade.<BR><BR>
<A href="http://images.google.com/imgres?imgurl=http://www.tedss.com/electronic-parts/images/capacitors/CeramicVariableCapacitor.gif&imgrefurl=http://www.zimtechdistributors.com/electronicdivision.htm&h=73&w=106&sz=3&hl=pt-BR&start=78&um=1&tbnid=AbswcMUkI7rWVM:&tbnh=58&tbnw=84&prev=/images%3Fq%3Dcapacitors%2Bvariable%2B%2Bmica%26start%3D60%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=58 src="http://tbn0.google.com/images?q=tbn:AbswcMUkI7rWVM:http://www.tedss.com/electronic-parts/images/capacitors/CeramicVariableCapacitor.gif" width=84></A> <BR>
<BR>
Claro depois temos o Supra-sumo, os de vacuo.<BR>
<A href="http://images.google.com/imgres?imgurl=http://www.nd2x.net/ur4ll/000-vac-caps.jpg&imgrefurl=http://www.nd2x.net/ur4ll.html&h=382&w=579&sz=23&hl=pt-BR&start=20&um=1&tbnid=Xf78t8fU3U-60M:&tbnh=88&tbnw=134&prev=/images%3Fq%3Dvacuum%2Bcapacitors%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DX"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=88 src="http://tbn0.google.com/images?q=tbn:Xf78t8fU3U-60M:http://www.nd2x.net/ur4ll/000-vac-caps.jpg" width=134></A> fixos ou variaveis. <A href="http://images.google.com/imgres?imgurl=http://www.g3ynh.info/comps/vac_c/vaccap_1.jpg&imgrefurl=http://www.g3ynh.info/comps/vac_caps.html&h=354&w=576&sz=31&hl=pt-BR&start=59&um=1&tbnid=j-x9aH-jzTpBHM:&tbnh=82&tbnw=134&prev=/images%3Fq%3Dvacuum%2Bcapacitors%26start%3D40%26ndsp%3D20%26um%3D1%26hl%3Dpt-BR%26client%3Dfirefox-a%26rls%3Dorg.mozilla:pt-BR:official%26sa%3DN"><IMG style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" height=82 src="http://tbn0.google.com/images?q=tbn:j-x9aH-jzTpBHM:http://www.g3ynh.info/comps/vac_c/vaccap_1.jpg" width=134></A><BR>
<BR>
73's<BR>
Matias<BR>
<BLOCKQUOTE>
<HR>
From: ct1hix@sapo.pt<BR>To: cluster@radio-amador.net<BR>Date: Sat, 5 Jul 2008 13:07:41 +0100<BR>Subject: ARLA/CLUSTER: Escolher Condensadores???<BR><BR>
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<DIV><FONT face=Arial size=2><SPAN class=EC_913543811-05072008>Boas</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=EC_913543811-05072008>Caros colegas, que cuidados devemos ter na escolha de condensadores para RF, para alem da capacidade e tensão de trabalho?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=EC_913543811-05072008>A escolha da tensão para um condensador a aplicar num circuito, na pràtica como é feita (por ex: Z alto = U alto)?</SPAN></FONT></DIV>
<DIV><SPAN class=EC_913543811-05072008><FONT face=Arial><FONT size=2>Se calhar a pergunta não tem sentido, mas com<SPAN class=EC_304490312-05072008>o </SPAN>fico <SPAN class=EC_304490312-05072008>com a</SPAN> "cabeça andar à roda" quando tenho que escolher um condensador<SPAN class=EC_304490312-05072008>, resolvi faze-la.</SPAN></FONT></FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2><SPAN class=EC_913543811-05072008></SPAN></FONT> </DIV>
<DIV><SPAN class=EC_913543811-05072008>
<DIV align=left><FONT face=Arial size=2>73 CT1HIX Gomes</FONT></DIV></SPAN></DIV></DIV><BR>
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