Return-Path: Received: (qmail 19887 invoked from network); 9 May 2003 14:14:02 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 9 May 2003 14:14:02 -0000 Received: (qmail 11763 invoked from network); 9 May 2003 14:14:05 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 9 May 2003 14:14:05 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 19E8cp-0001z1-Ly for rsgb_lf_group-outgoing@blacksheep.org; Fri, 09 May 2003 15:13:27 +0100 Received: from [193.82.116.10] (helo=public.thorcom.com ident=[UoWHu0H0XDxKlZQDI+zPNwJsngQDOt6m]) by post.thorcom.com with esmtp (Exim 4.14) id 19E8ch-0001ys-Cg for rsgb_lf_group@blacksheep.org; Fri, 09 May 2003 15:13:19 +0100 Received: from cmailg4.svr.pol.co.uk ([195.92.195.174]) by public.thorcom.com with esmtp (Exim 4.12) id 19E8cg-00086L-00 for rsgb_lf_group@blacksheep.org; Fri, 09 May 2003 15:13:18 +0100 Received: from modem-94.dunedain.dialup.pol.co.uk ([62.136.159.222] helo=f3a3a2) by cmailg4.svr.pol.co.uk with smtp (Exim 4.14) id 19E8af-0004IJ-Id for rsgb_lf_group@blacksheep.org; Fri, 09 May 2003 15:11:13 +0100 Message-ID: <002801c31635$1573e360$ea00a8c0@f3a3a2> From: "Laurie Mayhead" To: rsgb_lf_group@blacksheep.org Date: Fri, 9 May 2003 15:11:20 +0100 MIME-Version: 1.0 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 X-SA-Exim-Rcpt-To: rsgb_lf_group@blacksheep.org Subject: LF: An interesting antenna experiment. Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.0 required=5.0tests=noneversion=2.53 X-Spam-Checker-Version: SpamAssassin 2.53 (1.174.2.15-2003-03-30-exp) 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: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false I took advantage of the good weather this week to modify my 136/73kHz Tx antenna. Looking for a few more mW on 73.Based on the theory that more wire in the air=less ground loss resistance,I increased the length of one of my top load legs by 20m.This involved another rope over a 60 foot oak tree, lots of bow and arrow work BUT instead of the modest increase in current that I expected it actually dropped by 0.25A. Experiance indicates that the new wire should be over "new" ground ie not too close to existing wires,unfortunately the new wire was rather close (about 10m at the far end) however what was more significant was that the new wire passed directly over a dense area of Rhodedendron bushes about 10-12 feet high, so it looks like the increase in"tree loss resistance" exceeded any reduction in ground loss due to the extra wire. Needless to say I am back to square one ! but watch that greenery its lethal to RF. 73 Laurie.