Return-Path: Received: from mtain-di09.r1000.mx.aol.com (mtain-di09.r1000.mx.aol.com [172.29.64.13]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD042-86324c19e2be3b9; Thu, 17 Jun 2010 04:54:22 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9920838002111; Thu, 17 Jun 2010 04:54:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OPAqG-0007jO-Mr for rs_out_1@blacksheep.org; Thu, 17 Jun 2010 09:52:56 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OPAqG-0007jF-9D for rsgb_lf_group@blacksheep.org; Thu, 17 Jun 2010 09:52:56 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OPAqE-0001CL-HC for rsgb_lf_group@blacksheep.org; Thu, 17 Jun 2010 09:52:56 +0100 Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 541BD51C011 for ; Thu, 17 Jun 2010 10:52:44 +0200 (CEST) Received: from ICTS-S-HUB-N3.luna.kuleuven.be (icts-s-hub-n3.luna.kuleuven.be [10.112.9.13]) by smtps02.kuleuven.be (Postfix) with ESMTP id 4D299F3863 for ; Thu, 17 Jun 2010 10:52:44 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N3.luna.kuleuven.be ([10.112.9.13]) with mapi; Thu, 17 Jun 2010 10:52:44 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Thu, 17 Jun 2010 10:49:22 +0200 Thread-Topic: LF: RE: Who needs antennas! - success with ground electrodes on 500kHz Thread-Index: AcsN9AGcAv3P7LVSRuGinxtIbDdEEgABfkFj Message-ID: References: <648287CF-49D0-4E2E-BCE5-B20F634C9384@numeo.fr> <569132.43932.qm@web81107.mail.mud.yahoo.com>, In-Reply-To: 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,HTML_MESSAGE=0.001 Subject: RE: LF: RE: Who needs antennas! - success with ground electrodes on 500kHz Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C5107CB1291ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,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: 3039ac1d400d4c19e2bc7040 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C5107CB1291ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Roger, just a thought: did you have a "conventional" 500kHz antenna up during the= tests ? In that case the ground loop might be coupling (a part of) the energy into= the other antenna. 73, Rik ON7YD - OR7T Well, I'm amazed. This evening I connected my 500kHz transverter straight to the two connect= ions of my sub-9kHz grounded electrodes and TXed WSPR. No attempt was made= to match anything on the assumption that the two electrodes system looked= not too far from 50 ohms resistive as measured between 1-9kHz.. Pout from= the IRF510 is around 5W. What happened? Three people copied me - M0BMU, G7NKS and M0JXM with reports between -21= and -28dB S/N. The wire to the furtherest ground rod is at most 20m long= and most of the way it is 1.5m above ground. Once again, this must be act= ing as a pretty effective loop mostly within the ground. Screen grab of= the WSPR log attached. So, if you live on clunchy chalk soils like me then don't worry too much= about big antennas, :-) 73s Roger G3XBM --_000_BF4A524700075746A6467658DFC7102C5107CB1291ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Roger,

 

just a thought: did you have a "conventional" 500kHz antenna= up during the tests ?

In that case the ground loop might be= coupling (a part of) the energy into the other antenna.

 

73, Rik  ON7YD - OR7T

 

 

Well, I'm amazed.

This evening I connected my 500kHz transverter straight to the two connect= ions of my sub-9kHz grounded electrodes and TXed WSPR. No attempt was made= to match anything on the assumption that the two electrodes system looked= not too far from 50 ohms resistive as measured between 1-9kHz.. Pout from the IRF510 is around 5W. What happ= ened?

Three people copied me - M0BMU, G7NKS and M0JXM with reports between -21 and -28dB S/N.= The wire to the furtherest ground rod is at most 20m long and most of the= way it is 1.5m above ground. Once again, this must be acting as a pretty effective loop mostly within the ground.&= nbsp; Screen grab of the WSPR log attached.

So, if you live on clunchy chalk soils like me then don't worry too much= about big antennas, :-)

73s
Roger G3XBM

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