Return-Path: Received: (qmail 9682 invoked from network); 12 Mar 2002 09:06:26 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 12 Mar 2002 09:06:26 -0000 Received: (qmail 21732 invoked from network); 12 Mar 2002 09:06:17 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 12 Mar 2002 09:06:17 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16kjaS-00052i-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 12 Mar 2002 10:32:56 +0000 Received: from protactinium.btinternet.com ([194.73.73.176]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16kjaR-00052d-00 for rsgb_lf_group@blacksheep.org; Tue, 12 Mar 2002 10:32:55 +0000 Received: from host62-7-85-21.in-addr.btopenworld.com ([62.7.85.21] helo=dave) by protactinium.btinternet.com with smtp (Exim 3.22 #8) id 16ki3W-0004bV-00 for rsgb_lf_group@blacksheep.org; Tue, 12 Mar 2002 08:54:50 +0000 Message-ID: <002101c1c9a3$dd6c5080$1555073e@dave> From: "Dave Sergeant" To: "rsgb_lf_group" References: <3.0.1.16.20020311093458.2d17e36a@pb623250.kuleuven.be> Subject: LF: Re: loops Date: Tue, 12 Mar 2002 08:56:19 -0000 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 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >From Dave G3YMC Rik ON7YD wrote: >Assume you gave a loop with a radiation resistance of 1 milli-Ohm and a >loss of 5 Ohm I hope that is just an example. If you really have a transmitting loop with a series R of 5 ohms you are wasting your time. Mine has a dc resistance of around 0.1 ohms, and an effective series resistance once earth coupling losses and skin effect are taken into account of 0.65 ohms. I notice this series resistance figure was not given in G3KEV's recent mail, it is by far the most important characteristic of a transmitting loop. See my website where all these things are explained. Dave G3YMC dsergeant@iee.org dsergeant@btinternet.com http://www.dsergeant.btinternet.co.uk