Return-Path: Received: from mtain-dj09.r1000.mx.aol.com (mtain-dj09.r1000.mail.aol.com [172.19.187.145]) by air-df01.mail.aol.com (v129.4) with ESMTP id MAILINDF014-5ee54c1b351729; Fri, 18 Jun 2010 04:57:59 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2C764380000FD; Fri, 18 Jun 2010 04:57:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OPXNp-00084L-I7 for rs_out_1@blacksheep.org; Fri, 18 Jun 2010 09:57:05 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OPXNp-00084C-5g for rsgb_lf_group@blacksheep.org; Fri, 18 Jun 2010 09:57:05 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OPXNn-0006yU-9m for rsgb_lf_group@blacksheep.org; Fri, 18 Jun 2010 09:57:05 +0100 Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id C24BE51C002 for ; Fri, 18 Jun 2010 10:56:52 +0200 (CEST) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps02.kuleuven.be (Postfix) with ESMTP id C2081F3863 for ; Fri, 18 Jun 2010 10:56:52 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Fri, 18 Jun 2010 10:56:52 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Fri, 18 Jun 2010 10:56:52 +0200 Thread-Topic: LF: Earth electrode loop and 500kHz ERP Thread-Index: AcsOvkk4liET/ELpTzeGR/yc0wRtQAABQGmt Message-ID: References: ,<4C1B29FB.7090502@telia.com> In-Reply-To: <4C1B29FB.7090502@telia.com> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: RE: LF: Earth electrode loop and 500kHz ERP 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: 3039cdbc9d0e4c1b3515291c X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Roger, Johan, I had a look at the WSPR data on june 16 between 18 and 20 UTC (daylight): At G7NKS: both G3XBG and G3ZJO are at 46km, G3ZJO was in average 3dB stro= nger At M0BMU: G3ZJO (76km) is about 8 dB stronger than G3XBM (69km) But I believe that Jim is using a loop for RX and the angle between ZJO= and XBM is about 70 degrees, so that can cause some dB difference (depend= ing on how Jim's loop is orientated). This can give a clue about the difference in ERP between Roger and Eddy. 73, Rik ON7YD - OR7T ________________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Johan H. Bodin [jh.bodin@telia.com] Verzonden: vrijdag 18 juni 2010 10:10 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: Earth electrode loop and 500kHz ERP Roger, the programs SOILSKIN and EARTHRES by G4FGQ (SK) will not answer your ques= tions directly but they are related to your questions and they are interesting= to play with (many of his programs are). http://www.zerobeat.net/G4FGQ/ 73 Johan SM6LKM ---- Roger Lapthorn wrote: > Questions: > > 1. Now, how big is the loop thus formed? > 2. How much of this is within the ground? > 3. What is the 500kHz ERP likely to be?