Return-Path: Received: (qmail 22868 invoked from network); 23 Nov 1999 16:14:08 +0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by guiness.force9.net with SMTP; 23 Nov 1999 16:14:08 +0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11qHLW-0003eK-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 23 Nov 1999 14:55:06 +0000 Received: from mail2.hamilton-standard.com ([153.4.57.12]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11qHLV-0003eA-00 for rsgb_lf_group@blacksheep.org; Tue, 23 Nov 1999 14:55:05 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from curly.hsd.utc.com by mail2.hamilton-standard.com; (8.9.1/) id KAA26585; Tue, 23 Nov 1999 10:03:01 -0500 (EST) Received: from umrsvr.hsd.utc.com by curly.hsd.utc.com; (5.65v3.2/1.1.8.2/27Feb96-0334PM) id AA08704; Tue, 23 Nov 1999 09:54:19 -0500 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from nmex01nt.hsd.utc.com by umrsvr.hsd.utc.com; (8.9.0/) id JAA32001; Tue, 23 Nov 1999 09:50:08 -0500 (EST) Received: by nmex01nt.hsd.utc.com with Internet Mail Service (5.5.2448.0) id ; Tue, 23 Nov 1999 15:50:05 +0100 Message-ID: From: "Soegiono, Gamal" To: rsgb_lf_group@blacksheep.org Subject: LF: receiving loop design Date: Tue, 23 Nov 1999 15:50:04 +0100 X-Mailer: Internet Mail Service (5.5.2448.0) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Hello Bernd Grupe, hello All DF8ZR> Soegiono Gamal has built a loop recently. DF8ZR> Got a description and made a little DF8ZR> illustration. I put it on my website: DF8ZR> http://home.t-online.de/home/Bernd.Grupe/homepage.htm DF8ZR> at index 3.2.4 Well - the design of this loop is not based on my own... ...I should have pointed out this fact to Bernd a bit clearer. I just implemented and tested what Bryce Ofstie, ki0LE [ki0le@cp.duluth.mn.us] has posted on his web-page http://www.computerpro.com/~ki0le/pages/loop1.htm There you will find comprehensive building instructions and a lot of pictures which illustrate it's design features. DF8ZR> High Q and low stray-capacitance of his construction DF8ZR> permits a definitely outstanding performance, DF8ZR> so Gamal pointed out. It was Bryce Ofstie's idea to remember a design feature which dates back to the 1920s - the winding scheeme, which may be characterized as "spider web weaved" or "basket weaved" loop windings. The performance - low residual capacity AND low proximity effect - is inherent in this kind of loop winding scheeme. My implementation thereof gives indeed satisfactory results which can be viewed on Bernd Grupe's web page. 73 de Gamal