Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: (qmail 23115 invoked from network); 15 Mar 2005 09:08:45 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore03.plus.net with SMTP; 15 Mar 2005 09:08:45 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DB86c-0003TQ-VU for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:12:52 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DB86c-0003TN-Op for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:12:50 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DB84r-00059e-Ln for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:11:01 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DB82V-0004R1-36 for rs_out_1@blacksheep.org; Tue, 15 Mar 2005 09:08:35 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DB82U-0004Qs-Oy for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:08:34 +0000 Received: from mailout.zetnet.co.uk ([194.247.47.231]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DB82T-00007q-F3 for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:08:34 +0000 Received: from irwell.zetnet.co.uk ([194.247.47.48] helo=zetnet.co.uk) by mailout.zetnet.co.uk with esmtp (Exim 3.36 #1 (Debian)) id 1DB82T-0007rO-00 for <rsgb_lf_group@blacksheep.org>; Tue, 15 Mar 2005 09:08:33 +0000 Received: from john-b5a82ea1a4 (bts-0497.dialup.zetnet.co.uk [194.247.49.241]) by zetnet.co.uk (8.12.11/8.12.11/Debian-5) with ESMTP id j2F98SgT013805 for <rsgb_lf_group@blacksheep.org>; Tue, 15 Mar 2005 09:08:32 GMT Message-ID: <200503150908350834.03E22602@mail.zetnet.co.uk> In-Reply-To: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> References: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> X-Mailer: Courier 3.50.00.09.1098 (http://www.rosecitysoftware.com) (K) Date: Tue, 15 Mar 2005 09:08:35 +0000 From: "John Rabson" <word.factory@zetnet.co.uk> To: rsgb_lf_group@blacksheep.org Mime-Version: 1.0 X-SPF-Result: relay.thorcom.net: 194.247.47.231 is neither permitted nor denied by domain of zetnet.co.uk X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: LF: Untuned loops Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Ian Drummond described something like this in an early issue of CREGJ. I will see what I can find. John G3PAI *********** REPLY SEPARATOR *********** On 15/03/2005 at 09:01 Andy wrote: >Can anyone recall this equation, I know it was mentioned on this >reflector before... > >What is the output voltage for an untuned small loop into an arbitrarily >high impedance? It is proportional to H, and presumably F^2, and I seem >to recall it is an absolute value, virtually un-influenced by losses, >conductor diameter etc. Therefore can be used for accurate H field (and >hence far field radiation) signal strength measurements. > >Andy G4JNT