Return-Path: Received: (qmail 60166 invoked from network); 4 Jan 2004 20:08:17 -0000 Received: from unknown (HELO ptb-mxscan01.plus.net) (212.159.14.235) by ptb-mailstore01.plus.net with SMTP; 4 Jan 2004 20:08:17 -0000 Received: (qmail 5246 invoked from network); 4 Jan 2004 20:08:16 -0000 Content-Transfer-Encoding: 8bit X-Filtered-by: Plusnet (hmail v1.01) X-MSMail-Priority: Normal X-Spam-detection-level: 11 Received: from ptb-mxcore01.plus.net (212.159.14.215) by ptb-mxscan01.plus.net with SMTP; 4 Jan 2004 20:08:16 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1AdEXn-0001Fq-PS for dave@picks.force9.co.uk; Sun, 04 Jan 2004 20:08:15 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AdEXR-0006GF-Hw for rs_out@blacksheep.org; Sun, 04 Jan 2004 20:07:53 +0000 Received: from [213.40.2.14] (helo=gourd.sout.netline.net.uk) by post.thorcom.com with esmtp (Exim 4.14) id 1AdEXR-0006G2-07 for rsgb_lf_group@blacksheep.org; Sun, 04 Jan 2004 20:07:53 +0000 Received: from [213.40.202.193] (helo=taylormade) by gourd.sout.netline.net.uk with smtp (Exim 4.24) id 1AdEWv-0003bI-NQ for rsgb_lf_group@blacksheep.org; Sun, 04 Jan 2004 20:07:22 +0000 From: "G4WGT - Gary" To: rsgb_lf_group@blacksheep.org Date: Sun, 04 Jan 2004 20:07:44 -0000 X-Priority: 3 In-reply-to: <000201c3d2db$27f8e680$6ce4fc3e@l8p8y6> X-Bad-Message-ID: no DNS (taylormade) Message-ID: <613WA6ZYUPYVZVTRMA0PJ2XC83X84LG.3ff87290@taylormade> MIME-Version: 1.0 X-Mailer: Opera 6.03 build 1107 Subject: Re: LF: Re: Antenna's Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 2 04/01/2004 14:19:22, "hamilton mal" wrote: >My suggestion is to use the mast as a support for a vertical arrangement. >Connect all horizontal wires regardless of configuration together at the top >of your 14 metre mast and use a vertical drop lead to connect to your >loading/matching coil. ie a top loaded vertical. Keep the drop wire about 1 >metre out and away from the mast, the wire does not have to be exactly >vertical pull it out at the bottom end about 2 metres. I am assuming your >mast is earthed, if not use the mast as the vertical radiator with the top >wires connected directly to it at the top and feed the bottom end of mast to >the loading coil. Resonate the coil for your preferred frequency on 136 khz >and use a smaller coil at he bottom feed end in series to earth as a 50 ohm >matching device. Earth the coax braid and tap the coax centre conductor up a >few turns from earth to get the perfect match. A small call is preferable to >get an accurate match, tapping up the large coil from the bottom is too >coarse. >Hope this helps you but maybe you know all of this already hi >73 de Mal/G3KEV Hi Mal, Thanks for your reply & comments, most of the info I am already aware of, I was just considering wether to feed at the centre of the inverted V (bow tie shape) or at one end of the inverted V. I know its probably a case of "suck it & see" never-the-less I do appreciate any-ones comments on the matter. At the moment I am matching the coil with a transformer wound on a TV scan coil core with 10 turns pri & 20 turns tapped on sec & it gives me 1 : 1 match as far as my equipment shows. 73 Gary - G4WGT