Return-Path: Received: (qmail 28777 invoked from network); 13 Nov 2002 20:27:27 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 13 Nov 2002 20:27:27 -0000 Received: (qmail 23545 invoked by uid 10001); 13 Nov 2002 19:26:43 -0000 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 13 Nov 2002 19:26:43 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18C38m-0006fD-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 13 Nov 2002 19:25:32 +0000 Received: from [62.253.164.46] (helo=mta6-svc.business.ntl.com) by post.thorcom.com with esmtp (Exim 4.10) id 18C38l-0006f4-00 for rsgb_lf_group@blacksheep.org; Wed, 13 Nov 2002 19:25:32 +0000 Received: from l8p8y6 ([62.252.208.149]) by mta6-svc.business.ntl.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20021113192529.KWYQ9450.mta6-svc.business.ntl.com@l8p8y6> for ; Wed, 13 Nov 2002 19:25:29 +0000 Message-ID: <001801c28b4a$5fb16fe0$95d0fc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20021111102152.00a924d8@gemini.herts.ac.uk> Date: Wed, 13 Nov 2002 19:23:14 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: Re: LF: Question on building homebrew variable caps... Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-0.2 required=5.0tests=DEAR_SOMEBODY,QUOTED_EMAIL_TEXT,REFERENCES, SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group ----- Original Message ----- From: "James Moritz" To: Sent: Monday, November 11, 2002 10:31 AM Subject: Re: LF: Question on building homebrew variable caps... > At 21:28 10/11/2002 -0600, you wrote: > >I would like to know if anyone has built variable capacitors for > >transmitters or tuners. I would like to build a variable capacitor that is > >at least 100pf and can handle 40 amps of RF current. Does anyone have any > >ideas or links to some articles??? > >Thanks es 73's, > >Mike>WE0H > >http://www.we0h.us/lf.html > > Dear Mike, LF group, > > What frequency is it for? Surely not LF - at 185kHz, the voltage rating > might be a problem - about 340kV with 40A! This is what I have been saying all along about loops and power levels around the 1W plus on LF. The only sensible antenna for transmitting on LF is a vertical to cater for medium and higher power levels. Loops work for receiving with the directional limitation but then a few feet of wire lying on the ground works just as well !! de G3KEV > > Cheers, Jim Moritz > 73 de M0BMU > >