Return-Path: Received: (qmail 24848 invoked from network); 14 May 2002 08:44:05 -0000 Content-Transfer-Encoding: 8bit X-Priority: 3 Received: from unknown (HELO marstons.services.quay.plus.net) (212.159.14.223) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 14 May 2002 08:44:05 -0000 X-MSMail-Priority: Normal Received: (qmail 15728 invoked by uid 10001); 14 May 2002 08:47:58 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 14 May 2002 08:47:58 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 177Xs4-0007oA-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 14 May 2002 09:41:24 +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 177Xs3-0007o5-00 for rsgb_lf_group@blacksheep.org; Tue, 14 May 2002 09:41:23 +0100 Received: from fitec.omskcity.com (mu06.dialup2.infomsk.ru [212.164.44.118]) by astral.omskcity.com (8.9.3/8.9.3) with SMTP id PAA3ce0ccc00936 for ; Tue, 14 May 2002 15:37:20 +0700 (OSS) Date: Tue, 14 May 2002 16:17:40 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org Subject: RE: LF: Ground loss In-reply-to: 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 LF Group > On Sat, 23 Mar 2002, john sexton wrote: > If you do find a model that works, please let us know. On the base of my own "generalased mirror reflection theory" I just have derive the formula for ground loss resistance: R = (lant/lcp)*a*Xc where: lant - wire length of antenna, lcp - wire length of ground system (conterpoint), a = (eps0*w)/s, eps0 - dielectric constant (8.85e-12 F/m), w = 6.28*f - circular frequency, s - ground conductivity. Xc = 1/(w*C) - antenna reactance, C - antenna capasitance. For 136 kHz and s=1 mSm/m a is about 0.01 The formula is very aproximative but yelds reasonable value of R. Now I work on more advanced formula wich should be more accurate. Any coments please! 73 de RA9MB/Alex http://www.qsl.net/ra9mb