Return-Path: Received: (qmail 33342 invoked from network); 15 Mar 2005 10:36:23 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 15 Mar 2005 10:36:23 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DB9Sv-0005r6-W6 for dave@picks.force9.co.uk; Tue, 15 Mar 2005 10:40:01 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DB9Sv-0005r2-ST for dave@picks.force9.co.uk; Tue, 15 Mar 2005 10:39:57 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1DB9PO-0002jd-GD for dave@picks.force9.co.uk; Tue, 15 Mar 2005 10:36:18 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DB9PB-000589-7P for rs_out_1@blacksheep.org; Tue, 15 Mar 2005 10:36:05 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DB9PA-000580-Qh for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 10:36:04 +0000 Received: from cmsout01.mbox.net ([165.212.64.31]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DB9P7-0000qY-Ut for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 10:36:04 +0000 Received: from cmsout01.mbox.net (cmsout01.mbox.net [165.212.64.31]) by cmsout01.mbox.net (Postfix) with ESMTP id 873F3780A1 for ; Tue, 15 Mar 2005 10:35:54 +0000 (GMT) Received: from uadvg131.cms.usa.net [165.212.11.131] by cmsout01.mbox.net via smtad (C8.MAIN.3.21U); Tue, 15 Mar 2005 10:35:54 GMT X-USANET-Source: 165.212.11.131 IN dibene@usa.net uadvg131.cms.usa.net X-USANET-MsgId: XID530Jcokj35919X01 Received: from [192.168.0.2] [151.46.155.111] by uadvg131.cms.usa.net (ASMTP/dibene@usa.net) via mtad (C8.MAIN.3.21E) with ESMTP id 661Jcokj10103M31; Tue, 15 Mar 2005 10:35:52 GMT X-USANET-Auth: 151.46.155.111 AUTH dibene@usa.net [192.168.0.2] Message-ID: <4236BA86.10909@usa.net> Date: Tue, 15 Mar 2005 11:35:50 +0100 From: Alberto di Bene User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> In-Reply-To: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> X-Enigmail-Version: 0.89.5.0 X-Enigmail-Supports: pgp-inline, pgp-mime Z-USANET-MsgId: XID661Jcokj10103X31 X-SPF-Result: relay.thorcom.net: 165.212.64.31 is neither permitted nor denied by domain of usa.net X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=no,HTML_50_60=0.095,HTML_MESSAGE=0.001,HTML_TITLE_EMPTY=0.045 Subject: Re: 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-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TITLE_EMPTY 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 A good discussion (with formulas) on the subject can be found here :
http://www.vlf.it/octoloop/rlt-n4ywk.htm

73 Alberto I2PHD
--------------------------------------------

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