Return-Path: Received: (qmail 12887 invoked from network); 3 Jun 2000 18:30:09 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 3 Jun 2000 18:30:09 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12yIaQ-0007m7-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 03 Jun 2000 19:23:54 +0100 Received: from irwell.zetnet.co.uk ([194.247.47.48] ident=root) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12yIaO-0007m2-00 for rsgb_lf_group@blacksheep.org; Sat, 03 Jun 2000 19:23:53 +0100 Received: from oemcomputer (man-038.dialup.zetnet.co.uk [194.247.41.47]) by irwell.zetnet.co.uk (8.9.3/8.9.3/Debian/GNU) with SMTP id TAA22634 for ; Sat, 3 Jun 2000 19:23:46 +0100 X-Authentication-Warning: irwell.zetnet.co.uk: Host man-038.dialup.zetnet.co.uk [194.247.41.47] claimed to be oemcomputer Message-ID: <002601bfcd89$06e2be40$2f29f7c2@oemcomputer> From: "John Rabson" To: rsgb_lf_group@blacksheep.org References: <22021.200005301550@gemini> Subject: LF: Re: Big & Small antennas - Reply to comments Date: Sat, 3 Jun 2000 19:24:44 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 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: ----- Original Message ----- From: James Moritz To: Sent: Tuesday, May 30, 2000 5:57 PM Subject: LF: Big & Small antennas - Reply to comments > Possible Causes: > > My money is on the increased field strengths being due to fields > and currents under the ground surface, resulting in greater > effective height of the antenna. Obviously, this needs more > investigation, which I hope to try later. By the way, have any of the > cave radio community made underground field strength > measurements? Yes, we have. There is a piece on earth electrode based cave radio experiments in issue 40 of the Cave Radio & Electronics Group Journal (ISSN 1361-4800). See also http://www.mcrosolv.demon.co.uk/caves.org/radio/ to search for articles using David Gibson's on-line digest. 73 de John Rabson G3PAI