Return-Path: Received: from mtain-md08.r1000.mx.aol.com (mtain-md08.r1000.mx.aol.com [172.29.96.92]) by air-df04.mail.aol.com (v129.4) with ESMTP id MAILINDF042-5eef4c42dfc7252; Sun, 18 Jul 2010 07:04:39 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-md08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 810A73800007E; Sun, 18 Jul 2010 07:04:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OaRej-00032g-U9 for rs_out_1@blacksheep.org; Sun, 18 Jul 2010 12:03:37 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OaRej-00032X-IB for rsgb_lf_group@blacksheep.org; Sun, 18 Jul 2010 12:03:37 +0100 Received: from mhost02h.leeds.ac.uk ([129.11.77.151]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OaRei-0001GN-Tc for rsgb_lf_group@blacksheep.org; Sun, 18 Jul 2010 12:03:37 +0100 Received: from APOLLO1.ds.leeds.ac.uk (apollo1.leeds.ac.uk [129.11.5.4]) by mhost02h.leeds.ac.uk (8.14.3/8.14.3) with ESMTP id o6IB3UUn022323 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for ; Sun, 18 Jul 2010 12:03:30 +0100 (BST) Received: from HERMES8.ds.leeds.ac.uk ([fe80::c078:16b5:73cf:6fbc]) by APOLLO1.ds.leeds.ac.uk ([129.11.5.4]) with mapi; Sun, 18 Jul 2010 12:03:30 +0100 From: Chris Trayner To: "rsgb_lf_group@blacksheep.org" Date: Sun, 18 Jul 2010 12:03:29 +0100 Thread-Topic: LF: EARTH MODE Thread-Index: AcsmaNr90L/Ab6AXQduJIAa/LM1jkg== Message-ID: References: <002401cb2662$106e5db0$0401a8c0@xphd97xgq27nyf> <06EC7774-839A-4E75-835C-717830FE5963@leeds.ac.uk> <003701cb2667$39072e50$0401a8c0@xphd97xgq27nyf> In-Reply-To: <003701cb2667$39072e50$0401a8c0@xphd97xgq27nyf> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: EARTH MODE Content-Type: text/plain; charset="us-ascii" 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=TO_ADDRESS_EQ_REAL 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-global-disposition: G x-aol-sid: 3039ac1d605c4c42dfc572e5 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Mal, On 2010 Jul 18, at 11:51, mal hamilton wrote: > Chris > Receiving signals on a piece of wire lying on the ground is totally > different to Transmitting a signal over any distance. You are getting in= to > the beverage antenna theory where signals can be received with some > advantage but useless for Transmitting, which is what some are trying to= do. Good point - you don't really worry about antenna efficiency at LF for Rx,= but of course you do need to for Tx. I agree with what you're saying. 73, Chris G4OKW ----------------------- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom Tel: +44 113 34 32053 Fax: +44 113 34 32032