Return-Path: Received: (qmail 28037 invoked from network); 1 Jul 1999 13:18:48 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 1 Jul 1999 13:18:48 +0100 Received: (qmail 30388 invoked from network); 1 Jul 1999 12:19:18 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 1 Jul 1999 12:19:18 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 10zfOx-0001ZA-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 01 Jul 1999 12:53:11 +0100 Received: from tk2.ihug.co.nz ([203.29.160.14] helo=smtp2.ihug.co.nz) by post.thorcom.com with esmtp (Exim 3.02 #1) id 10zfOv-0001Z5-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Jul 1999 12:53:09 +0100 Received: from test (p41-max2.chc.ihug.co.nz [207.214.13.41]) by smtp2.ihug.co.nz (8.9.3/8.9.3/Debian/GNU) with SMTP id XAA03326 for ; Thu, 1 Jul 1999 23:53:00 +1200 Message-ID: <000401bec3b8$50845080$0200a8c0@test> From: "Dave Brown" To: rsgb_lf_group@blacksheep.org References: Subject: LF: Re: AW: Re: Fw: Measuring field strength Date: Thu, 1 Jul 1999 23:53:17 +1200 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 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Wolf I never use HTML deliberately but this one slipped through by virtue of the 'reply in same format' check box being ticked. I would like to blame Microsoft for having too many options, but...... Text of message follows again .. this time in plain text in case it was HTML garbage for others as well! Dick, For your info, both your messages re measuring field strength did make it to the reflector. In case anyone wants to use the measurement method you outlined with an SLMS, but at other than 137 kHz, the relationship including the frequency term is as follows: Loop induced emf(volts) = 2*pi*(field strength in v/m)*(loop area in sq. metres)* (loop turns)/wavelength. Which for the single turn untuned circular loop case you quoted, can be simplified to; Loop induced emf (microvolts) = 16.449*freq(kHz)*loopdia(m)*loopdia(m)*field strength(v/m) Ref: Terman, "Radio Engineering", Section 11, Para 18. 73 Dave ZL3FJ