Return-Path: Received: (qmail 15393 invoked from network); 19 Nov 1999 19:48:01 +0000 Received: from unknown (HELO cask.force9.net) (195.166.128.29) by guiness.force9.net with SMTP; 19 Nov 1999 19:48:01 +0000 Received: (qmail 28253 invoked from network); 19 Nov 1999 19:48:04 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by cask.force9.net with SMTP; 19 Nov 1999 19:48:04 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11osrN-0004Rl-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 19 Nov 1999 18:34:13 +0000 Received: from mail12.svr.pol.co.uk ([195.92.193.215]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11osrM-0004Rg-00 for rsgb_lf_group@blacksheep.org; Fri, 19 Nov 1999 18:34:12 +0000 Received: from modem-240.name51.dialup.pol.co.uk ([62.136.185.240] helo=lvm) by mail12.svr.pol.co.uk with smtp (Exim 3.03 #0) id 11osrE-000358-00 for rsgb_lf_group@blacksheep.org; Fri, 19 Nov 1999 18:34:05 +0000 Message-ID: <000201bf32bc$8f54c100$f0b9883e@lvm> From: "LAWRENCE MAYHEAD" To: "rsgb lf group" Subject: LF: Radial / Counterpoise systems Date: Fri, 19 Nov 1999 18:29:41 -0000 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 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: Content-transfer-encoding: 8bit

Re. the ongoing discussion about radials etc. I once saw a 500 Khz installation which used a marconi "T" ant. with 3 top wires.Below was a counterpoise earth system which consisted of about 10 spaced wires equal in length to the top wires.these wires were about 10 feet above ground and were linked together.I suppose you could best call this system a " GROUND SCREEN " Obviously if the ant return current can be made to flow through this screen then ground losses will be reduced.I guess we could learn a lot from these 500Khz installations,but where is the information? I would especially like details of the tuning system,since to be effective the whole thing must be resonant.L.A.Moxon gives details of multiple short radials in his book "H.F.Antennas for all occasions" so we do at least have some information on this part of the system. 73 Laurie G3AQC.