Return-Path: Received: from rly-db06.mx.aol.com (rly-db06.mail.aol.com [172.19.130.81]) by air-db05.mail.aol.com (v121.5) with ESMTP id MAILINDB054-acc48847a802f2; Mon, 21 Jul 2008 08:01:10 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db06.mx.aol.com (v121.5) with ESMTP id MAILRELAYINDB062-acc48847a802f2; Mon, 21 Jul 2008 08:01:08 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1KKu4O-0004ZH-6a for rs_out_1@blacksheep.org; Mon, 21 Jul 2008 13:00:48 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1KKu4N-0004Z8-Qr for rsgb_lf_group@blacksheep.org; Mon, 21 Jul 2008 13:00:47 +0100 Received: from mserv4.leeds.ac.uk ([129.11.76.223]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1KKu4J-0003PO-Rc for rsgb_lf_group@blacksheep.org; Mon, 21 Jul 2008 13:00:47 +0100 Received: from dexbr1.ds.leeds.ac.uk (dexbr1.leeds.ac.uk [129.11.76.19]) by mserv4.leeds.ac.uk (8.14.3/8.14.3) with ESMTP id m6LC0XF8011588 for ; Mon, 21 Jul 2008 13:00:34 +0100 (BST) Received: from HERMES4.ds.leeds.ac.uk ([129.11.5.129]) by dexbr1.ds.leeds.ac.uk with Microsoft SMTPSVC(6.0.3790.3959); Mon, 21 Jul 2008 13:00:22 +0100 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Date: Mon, 21 Jul 2008 13:00:23 +0100 Message-ID: <731EB49F88B309428FFDDD2423F810E42BBC25@HERMES4.ds.leeds.ac.uk> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Loop Conundrum Thread-Index: AcjrJbm0c2EermvHQhmfP0nNRZxZyQAA2wKA From: "Chris Trayner" To: X-OriginalArrivalTime: 21 Jul 2008 12:00:23.0046 (UTC) FILETIME=[5AD9AA60:01C8EB29] X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: LF: RE: Loop Conundrum X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : + X-Mailer: Unknown (No Version) Dear Andy, Thanks for the interesting problem. > The resulting radiation pattern should have the nulls filled in, and be a reasonable approximation to omnidirectional in azimuth. Would it? I'd expect there to be directions in which the fields from the two loops were opposite and equal, giving nulls but in different directions. Specifically, I think there will be two directions at 45 degrees to the planes of the loops where at any instant you get (to put it crudely) a north pole from one loop, at 1/sqrt(2) of its max strength, and a south pole from the other, also at 1/sqrt(2) of max strength. I don't know about efficiency, though - you might have started an interesting technical discussion! 73, Chris G4OKW