Return-Path: Received: (qmail 15600 invoked from network); 14 May 2001 07:34:08 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 14 May 2001 07:34:08 -0000 Received: (qmail 18004 invoked from network); 14 May 2001 07:33:37 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 14 May 2001 07:33:37 -0000 X-Priority: 3 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14zClj-0001eM-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 14 May 2001 08:27:51 +0100 X-MSMail-Priority: Normal Received: from finch-post-11.mail.demon.net ([194.217.242.39]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14zClf-0001eH-00 for rsgb_lf_group@blacksheep.org; Mon, 14 May 2001 08:27:47 +0100 Received: from alg.demon.co.uk ([194.222.171.80]) by finch-post-11.mail.demon.net with esmtp (Exim 2.12 #1) id 14zCl9-000D2n-0B for rsgb_lf_group@blacksheep.org; Mon, 14 May 2001 07:27:15 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3AFF893B.C6A1349@alg.demon.co.uk> Date: Mon, 14 May 2001 08:28:59 +0100 From: "Steve Rawlings" X-Mailer: Mozilla 4.6 [en-gb]C-CCK-MCD NetscapeOnline.co.uk (Win98; I) X-Accept-Language: en-GB,en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Fundemental Ground System question References: <006401c0db4d$751a5a80$0100a8c0@mshome.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Paul W1VLF wrote: > Every now and then it seems neccessary to find several references on > a topic and approach it from a number of "different angles" I agree. When Nick and Mike recently asked about the relationship of current and voltage through/across a loading coil, we were treated to excellent contributions from Andy and from Rik (I'm glad that you sent your contribution, Rik - even if it was an 'oops'!!). > This is the case with all this talk about ground systems, losses > in earth, trees, building, etc. > Can someone point me to a sight where some of this is explained? You could start be reading the article "Build Efficient, Short Vertical Antennas" by Thomas Kuehl AC7A (QST, March 1998, p 39). There you will find the antenna system 'equivalent circuit' which you seek. > Do trees shunt current to earth? There seems to be a million > different values that need to be considered!!! Yes, in a way. The shunt path from our LF antennas to lossy objects such as trees and buildings has an equivalent series resistance - which serves to increase the resistance at the feedpoint, thereby increasing the losses. You can read all about this, and many other LF antenna topics, at the web site of Rik ON7YD. See: http://www.qsl.net/on7yd/136ant.htm > Confused in Connecticut. Anyone else in the same boat? Rather less so, since I joined this Reflector! Regards to all, Steve GW4ALG