Return-Path: Received: (qmail 12677 invoked from network); 6 Jun 2002 15:44:29 -0000 Content-Transfer-Encoding: 8bit X-Priority: 3 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 6 Jun 2002 15:44:29 -0000 X-MSMail-Priority: Normal Received: (qmail 8949 invoked by uid 10001); 6 Jun 2002 15:48:18 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 6 Jun 2002 15:48:18 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17FzDm-0001xJ-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 06 Jun 2002 16:30:42 +0100 Received: from astral.infomsk.ru ([212.164.44.2] helo=astral.omskcity.com) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17FzDl-0001xB-00 for rsgb_lf_group@blacksheep.org; Thu, 06 Jun 2002 16:30:41 +0100 Received: from fitec.omskcity.com (mu07.dialup2.infomsk.ru [212.164.44.119]) by astral.omskcity.com (8.9.3/8.9.3) with SMTP id WAA3cff7f8e479c for ; Thu, 6 Jun 2002 22:28:14 +0700 (OSS) Date: Thu, 6 Jun 2002 23:09:09 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Counterpoise Experiment In-reply-to: <5.1.0.14.0.20020605115057.00aa4808@gemini.herts.ac.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi James and Group. On Wed, 5 Jun 2002, James Moritz wrote: > With no counterpoise, the antenna loss resistance at 136kHz was 37ohms. > With the counterpoise as above, Rloss dropped to 32ohms, a reduction of > about 14%. What coil resistance You have? Or 37 ohm it is whithout coil resistance? > With antenna current of 5A, 1A (ie 20%) of RF current was > returned through the counterpoise. It seems to be much better if You will not use ground, conterpoise only. To reduce loss all the currend should return through conterpoise. In this case it is good to use ferrite transformer betwin TX and antenna to avoid HF voltage on TX box. 73 de RA9MB/Alex http://www.qsl.net/ra9mb