Return-Path: Received: (qmail 24742 invoked from network); 20 Dec 2002 15:18:23 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 20 Dec 2002 15:18:23 -0000 Received: (qmail 22124 invoked from network); 20 Dec 2002 15:18:20 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 20 Dec 2002 15:18:20 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18POtP-000422-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 20 Dec 2002 15:16:51 +0000 Received: from [208.181.178.237] (helo=neptune.imagenisp.com) by post.thorcom.com with esmtp (Exim 4.10) id 18POtO-00041t-00 for rsgb_lf_group@blacksheep.org; Fri, 20 Dec 2002 15:16:51 +0000 Received: from jsm ([204.244.18.84]) by neptune.imagenisp.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id Z1L7VB0F; Fri, 20 Dec 2002 07:19:34 -0800 Message-ID: <001501c2a839$b3db6f60$5412f4cc@jsm> From: "Steve McDonald" To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20021220113920.00af1d00@gemini.herts.ac.uk> Date: Fri, 20 Dec 2002 07:08:49 -0800 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: Balanced vs. Unbalanced loops Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.2 required=5.0tests=USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group I have had good results with an ordinary (unbalanced) air-core loop of 10' diameter. Nulls are approaching 50 db on groundwave signals. The loop uses a standard single-turn pickup loop out to the rx via 50 ohm coax. I agree with Jan that a preamp is of no value once your limiting noise floor is background sky/atmospheric noise. For those interested, construction plans for my 10-footer are here: http://www.imagenisp.ca/jsm/Loop.html Steve / VE7SL