Return-Path: Received: from rly-mg03.mx.aol.com (rly-mg03.mail.aol.com [172.20.83.109]) by air-mg03.mail.aol.com (v121_r2.12) with ESMTP id MAILINMG034-a0348b2ccb3a4; Mon, 25 Aug 2008 11:16:15 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg03.mx.aol.com (v121_r2.11) with ESMTP id MAILRELAYINMG035-a0348b2ccb3a4; Mon, 25 Aug 2008 11:16:06 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1KXdml-0005nz-3R for rs_out_1@blacksheep.org; Mon, 25 Aug 2008 16:15:15 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1KXdmk-0005nq-Om for rsgb_lf_group@blacksheep.org; Mon, 25 Aug 2008 16:15:14 +0100 Received: from smtp20.orange.fr ([80.12.242.26]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1KXdmh-0008GL-3v for rsgb_lf_group@blacksheep.org; Mon, 25 Aug 2008 16:15:14 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf2003.orange.fr (SMTP Server) with ESMTP id 6E5171C000DE for ; Mon, 25 Aug 2008 17:15:03 +0200 (CEST) Received: from JR (Mix-Dijon-106-4-53.w193-248.abo.wanadoo.fr [193.248.131.53]) by mwinf2003.orange.fr (SMTP Server) with ESMTP id 7430E1C000A1 for ; Mon, 25 Aug 2008 17:15:02 +0200 (CEST) X-ME-UUID: 20080825151502476.7430E1C000A1@mwinf2003.orange.fr Message-ID: <200808251715030768.082E674C@smtp.wanadoo.fr> X-Mailer: Courier 3.50.00.09.1098 (http://www.rosecitysoftware.com) (P) Date: Mon, 25 Aug 2008 17:15:03 +0200 From: "John RABSON" To: rsgb_lf_group@blacksheep.org Mime-Version: 1.0 X-Karma: -1000: uceprotect.blacklist: if-match(0) => return-bad(1.0) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Sensing loop Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable 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: domain : post.thorcom.com ; SPF_helo = n X-AOL-SCOLL-AUTHENTICATION: domain : wanadoo.fr ; SPF_822_from = n I have a 2 metre square 8 turn loop which is series resonant on 138kHz. To=20= calibrate this I am thinking of adding a single turn loop which can be fed w= ith a known current and therefore produce a known magnetic field. Should th= is turn be within the main winding or should it be a much smaller loop at th= e centre? John F5VLF