Return-Path: Received: from mtain-da01.r1000.mx.aol.com (mtain-da01.r1000.mx.aol.com [172.29.64.73]) by air-ma09.mail.aol.com (v129.4) with ESMTP id MAILINMA092-b5354c19e3be2ab; Thu, 17 Jun 2010 04:58:38 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 883A7380020C1; Thu, 17 Jun 2010 04:58:35 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OPAux-0007qL-Li for rs_out_1@blacksheep.org; Thu, 17 Jun 2010 09:57:47 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OPAux-0007qC-6y for rsgb_lf_group@blacksheep.org; Thu, 17 Jun 2010 09:57:47 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OPAuv-0001Hl-4h for rsgb_lf_group@blacksheep.org; Thu, 17 Jun 2010 09:57:47 +0100 Received: by bwz19 with SMTP id 19so3660939bwz.16 for ; Thu, 17 Jun 2010 01:57:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=h9rGBhBE9mtaIRbwjhp0dm78s2TIdzrZzDUZOrO8Hes=; b=SYJjsCWjrORu06792TY9Jjz9Qx37mPYrtohaDw4UkqvYgJJvzrDGLo1G0hISBKSzrP 6BPZ6afGeJ7YXHQKTtaW5GkiBzoVCJY6Fxre4hvsJpOSUmthZCGKkJq4QC8BTHT4V8fn duaXX2BM8uhLBaYQdYhCI1MtnAhF0raQgjFLU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=F1SUvwfk9l2tHQjcVl4t9xgvz9Cn4Ce2TLJFCuRLReK9WtnRhMWHfvdXfaA8QLt4T/ 1ZG5uI9auFYZdZdTX1/1iHBeemLYVeiIwhfhRMndmvzNSIpxaPIMZJzf7ntJCkcL4hJx nTAr8qI1WYRFk+3c1jD9nkza6n6y9WO9/5VF8= MIME-Version: 1.0 Received: by 10.204.160.145 with SMTP id n17mr7416146bkx.67.1276765063571; Thu, 17 Jun 2010 01:57:43 -0700 (PDT) Received: by 10.204.100.69 with HTTP; Thu, 17 Jun 2010 01:57:43 -0700 (PDT) In-Reply-To: References: <648287CF-49D0-4E2E-BCE5-B20F634C9384@numeo.fr> <569132.43932.qm@web81107.mail.mud.yahoo.com> Date: Thu, 17 Jun 2010 09:57:43 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) 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=0015175cd884136a9d0489360866 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, HTML_MESSAGE 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m237.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d40494c19e3bb678b X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0015175cd884136a9d0489360866 Content-Type: text/plain; charset=ISO-8859-1 No Rick, the only antennas in the air are a Rybakov HF vertical some 10m away and a V2000 VHF/UHF vertical. 73s Roger G3XBM On 17 June 2010 09:49, Rik Strobbe wrote: > 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 > connections 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 acting 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 > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0015175cd884136a9d0489360866 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable No Rick, the only antennas in the air are a Rybakov HF vertical some 10m= away and a V2000 VHF/UHF vertical.

73s
Roger G3XBM

On 17 June 2010 09:49, Rik Strobbe <Rik.Strobbe@fys.kuleu= ven.be> wrote:

Roger,

=A0

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.

=A0

73, Rik=A0 ON7YD - OR7T

=A0

=A0

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.= =A0 Screen grab of the WSPR log attached.

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

73s
Roger G3XBM




--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
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