Return-Path: Received: from mtain-me07.r1000.mx.aol.com (mtain-me07.r1000.mx.aol.com [172.29.96.143]) by air-mf10.mail.aol.com (v129.4) with ESMTP id MAILINMF104-8c004c192b87312; Wed, 16 Jun 2010 15:52:39 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-me07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 802D438000094; Wed, 16 Jun 2010 15:52:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OOyeJ-0004zq-I5 for rs_out_1@blacksheep.org; Wed, 16 Jun 2010 20:51:47 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OOyeJ-0004zg-2N for rsgb_lf_group@blacksheep.org; Wed, 16 Jun 2010 20:51:47 +0100 Received: from mail-fx0-f43.google.com ([209.85.161.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OOyeG-0007dy-S8 for rsgb_lf_group@blacksheep.org; Wed, 16 Jun 2010 20:51:47 +0100 Received: by fxm12 with SMTP id 12so2234943fxm.16 for ; Wed, 16 Jun 2010 12:51:39 -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=1pix8piT0dU9OcJScrWAon51seI+Xk1nfMckfgI5mLM=; b=UJ47+8SpBXwYem1wiSJGoxoGO6ywg4tbNC1/qdcE/LrAbI85VydC+LQSWnBN3Oo9BF uaj0Hoz1N+iaQpadQU4qKS52eYhDOpMP2P1N24lDH32W+8xr7NFulAgUPHTrgGO232JX pJnjkN4R4W/2WKSlkmm3nO1I7+Rw7HpYhnpuk= 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=D7HGWHS9YADEgbHt+N89hsMDrO+NMkBuAltV9xq/3/IgxZM3/rIW62qf/S8AJ8LlVg MdZPJmHOtTXC42+90C473pJiCXBHyJ0yThVPWNVTiKycfbk2p5+v9bvttm25SB11nffI ERwTR0YGnB69Ci20ami9Ub3rN3kG6QB6NVfa0= MIME-Version: 1.0 Received: by 10.204.73.202 with SMTP id r10mr6928708bkj.135.1276717898774; Wed, 16 Jun 2010 12:51:38 -0700 (PDT) Received: by 10.204.100.69 with HTTP; Wed, 16 Jun 2010 12:51:38 -0700 (PDT) In-Reply-To: References: Date: Wed, 16 Jun 2010 20:51:38 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276 Subject: Re: LF: RE: Who needs antennas! - success with ground electrodes on 500kHz Content-Type: multipart/alternative; boundary=0016e6dab47ed5b8ef04892b0c6c X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,MAILTO_TO_SPAM_ADDR 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-m238.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d608f4c192b8519eb X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0016e6dab47ed5b8ef04892b0c6c Content-Type: text/plain; charset=ISO-8859-1 Correction - I'm also copying *PE1GRL* at -18dB S/N using the earth electrode set-up! 73s Roger G3XBM On 16 June 2010 20:43, Dave G3WCB wrote: > That's pretty amazing. You must have really bad soil conductivity. Did > you try receiving on the earth-loop antenna? > > Would the technique work on 137 kHz, I wonder. > > 73, Dave G3WCB IO91RM, nr Windsor, S.E. England > > -----Original Message----- > *From:* owner-rsgb_lf_group@blacksheep.org [mailto: > owner-rsgb_lf_group@blacksheep.org]*On Behalf Of *Roger Lapthorn > *Sent:* 16 June 2010 20:11 > *To:* rsgb_lf_group@blacksheep.org > *Subject:* LF: Who needs antennas! - success with ground electrodes on > 500kHz > > 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 > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0016e6dab47ed5b8ef04892b0c6c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Correction - I'm also copying PE1GRL at -18dB S/N using the ear= th electrode set-up!

73s
Roger G3XBM

On 16 June 2010 20:43, Dave G3WCB <ganymede444@btopenworld.com> wrote:
That's=20 pretty amazing. You must have really bad soil conductivity. Did you try=20 receiving on the earth-loop antenna?
=A0
Would=20 the technique work on 137 kHz, I wonder.
=A0
73,=20 Dave G3WCB IO91RM, nr Windsor, S.E. England
-----Or= iginal Message-----
From:=20 = owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Roger= =20 Lapthorn
Sent: 16 June 2010 20:11
To:=20 rsgb_l= f_group@blacksheep.org
Subject: LF: Who needs antennas! -=20 success with ground electrodes on 500kHz

Well, I'= ;m amazed.=20

This evening I connected my 500kHz transverter straight to the= two=20 connections of my sub-9kHz grounded electrodes and TXed WSPR. No attempt= was=20 made to match anything on the assumption that the two electrodes system= looked=20 not too far from 50 ohms resistive as measured between 1-9kHz.. Pout fro= m the=20 IRF510 is around 5W. What happened?

Three people copied me -=20 M0BMU, G7NKS and M0JXM with reports between -21 and -28dB S/N. The wire= to the=20 furtherest ground rod is at most 20m long and most of the way it is 1.5m= above=20 ground. Once again, this must be acting as a pretty effective loop mostl= y=20 within the ground.=A0 Screen grab of the WSPR log attached.

So,= if=20 you live on clunchy chalk soils like me then don't worry too much ab= out big=20 antennas, :-)

73s
Roger G3XBM

--
http://g3xbm-qr= p.blogspot.com/
http://www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
G3XBM=20 =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL=20 G11088



--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
--0016e6dab47ed5b8ef04892b0c6c--