Return-Path: Received: (qmail 52045 invoked from network); 15 Mar 2005 09:04:23 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore04.plus.net with SMTP; 15 Mar 2005 09:04:23 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DB81u-000Mfs-Fx for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:08:01 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DB81t-000Mfl-Rf for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:07:57 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1DB819-00079B-Co for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:07:11 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DB7xw-0004N0-9X for rs_out_1@blacksheep.org; Tue, 15 Mar 2005 09:03:52 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DB7xv-0004Mr-RT for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:03:51 +0000 Received: from one.surfree.co.uk ([195.80.0.234]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DB7xu-000064-Gc for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:03:51 +0000 Received: from standalone ([212.248.140.14]) by one.surfree.co.uk (8.9.3/8.9.3) with SMTP id KAA13845 for ; Tue, 15 Mar 2005 10:04:27 GMT Message-ID: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> From: "Andy" To: rsgb_lf_group@blacksheep.org Date: Tue, 15 Mar 2005 09:01:51 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 X-SPF-Result: relay.thorcom.net: 195.80.0.234 is neither permitted nor denied by domain of southsurf.com X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: Untuned loops Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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) Content-transfer-encoding: 8bit

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