Return-Path: Received: (qmail 31996 invoked from network); 15 Mar 2005 09:56:39 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore03.plus.net with SMTP; 15 Mar 2005 09:56:39 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DB8qV-000Fx1-2H for dave@picks.force9.co.uk; Tue, 15 Mar 2005 10:00:17 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DB8qU-000Fvo-71 for dave@picks.force9.co.uk; Tue, 15 Mar 2005 10:00:14 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DB8pB-0006wn-4t for dave@picks.force9.co.uk; Tue, 15 Mar 2005 09:58:53 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DB8mc-0004gs-D5 for rs_out_1@blacksheep.org; Tue, 15 Mar 2005 09:56:14 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DB8mb-0004gj-QN for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:56:13 +0000 Received: from imo-d06.mx.aol.com ([205.188.157.38]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DB8ma-0000Sa-96 for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2005 09:56:13 +0000 Received: from MarkusVester@aol.com by imo-d06.mx.aol.com (mail_out_v37_r3.8.) id l.111.45f03bb3 (15898) for ; Tue, 15 Mar 2005 04:56:01 -0500 (EST) Received: from mblk-r42 (mblk-r42.mblk.aol.com [152.163.179.41]) by air-id09.mx.aol.com (v104.18) with ESMTP id MAILINID91-3e1a4236b13125b; Tue, 15 Mar 2005 04:56:01 -0500 Date: Tue, 15 Mar 2005 04:56:01 -0500 Message-Id: <8C6F75C5444511E-9C0-33AF@mblk-r42.sysops.aol.com> From: markusvester@aol.com References: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> Received: from 217.194.34.125 by mblk-r42.sysops.aol.com (152.163.179.41) with HTTP (WebMailUI); Tue, 15 Mar 2005 04:56:01 -0500 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: <000d01c5293d$a1ddf8f0$0e8cf8d4@standalone> X-Mailer: AOL WebMail 1.0.0.11984 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-AOL-IP: 152.163.179.41 X-SPF-Result: relay.thorcom.net: domain of aol.com designates 205.188.157.38 as permitted sender X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=no,HTML_60_70=0.027,HTML_MESSAGE=0.001,MSGID_FROM_MTA_HEADER=0,NO_REAL_NAME=0.178 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=1.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MSGID_FROM_MTA_HEADER,NO_REAL_NAME 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
 
Hi Andy
 
 U = omega * ľo * H * area 
 
with ľo = 4 * pi * 10^-7 Vs/A/m, omega = 2 * pi * f .

73 de Markus, DF6NM
 
-----Original Message-----
From: Andy <actalbot@southsurf.com>
To: rsgb_lf_group@blacksheep.org
Sent: Tue, 15 Mar 2005 09:01:51 -0000
Subject: LF: Untuned loops

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