Return-Path: Received: (qmail 22551 invoked from network); 31 Mar 2002 14:19:31 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 31 Mar 2002 14:19:31 -0000 Received: (qmail 17501 invoked from network); 31 Mar 2002 14:19:29 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 31 Mar 2002 14:19:29 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16rhfa-0006u2-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 31 Mar 2002 16:55:02 +0100 Received: from carbon.btinternet.com ([194.73.73.92] helo=carbon) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16rhfY-0006tx-00 for rsgb_lf_group@blacksheep.org; Sun, 31 Mar 2002 16:55:01 +0100 Received: from host213-123-35-191.btinternet.com ([213.123.35.191] helo=dave) by carbon with smtp (Exim 3.22 #8) id 16rg8e-00033k-00 for rsgb_lf_group@blacksheep.org; Sun, 31 Mar 2002 15:16:57 +0100 Message-ID: <001301c1d8bf$2a2e11e0$bf237bd5@dave> From: "Dave Sergeant" To: rsgb_lf_group@blacksheep.org References: <008401c1d7df$3b4ee6b0$0100a8c0@athlon> Subject: LF: Re: RE: loops Date: Sun, 31 Mar 2002 15:06:56 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: The type of capacitor to be recommended for matching loops is the Philips 386 polypropylene series. Readily available in Europe in 10/22/47 values from 1nF to 100nF and above in 1kV and 2kV ratings. These are high pulse capacitors normally used in TV line output stages, they are also the best types to use for low pass filters in LF transmitters and anywhere else where high currents are involved. Silver mica types can be used for the fine tuning, as they will only take a fraction of the current of the parallel main capacitors. Information has been on my web site for about three years... 73s Dave G3YMC dsergeant@iee.org dsergeant@btinternet.com http://www.dsergeant.btinternet.co.uk