Return-Path: Received: from mtain-dh02.r1000.mx.aol.com (mtain-dh02.r1000.mx.aol.com [172.29.65.22]) by air-dd08.mail.aol.com (v129.4) with ESMTP id MAILINDD083-865e4c1e118a177; Sun, 20 Jun 2010 09:03:06 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3AC0838000137; Sun, 20 Jun 2010 09:03:02 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OQKAA-0006PZ-Nx for rs_out_1@blacksheep.org; Sun, 20 Jun 2010 14:02:14 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OQKAA-0006PO-4n for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 14:02:14 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OQKA8-0004qt-56 for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 14:02:14 +0100 Received: by bwz19 with SMTP id 19so767649bwz.16 for ; Sun, 20 Jun 2010 06:02:10 -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=zUsBD278RVMLIpK7QXpBwp3iRIb9kpERh0RrBqnB7BE=; b=nrv08O4fUWhfUg356LHndIkJmWUpw8YfQ53ZfQgWgMbFBQJdzNXwOc/N0NLKJ/ih+e vWWeB+GX+zc2xJ+mWiKZ79UyCaLCb2Pu/lsw7caSgpKimglqPJI4HtcprV6qZrXPPTL4 0H+RnYqSs5+8rM4a2PcD4XxN4vIVen+y/oxHM= 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=cTviylWfURY2hFxbyVI9u3b9jPzI+ThQNDd2oKvcWVx9WMl8/1L19SMzqlMTUclerX qV3aJnGCLT5OHajNYkEEnbp/RIWDhMG8sBdrcd2uuEmwqU+wkcFZUFo8Qu9KnGsZW7cZ ZxpZVE8XrL3RzPbj28PBzEyDHB3dSblZIRp6E= MIME-Version: 1.0 Received: by 10.204.47.20 with SMTP id l20mr1814656bkf.132.1277038930688; Sun, 20 Jun 2010 06:02:10 -0700 (PDT) Received: by 10.204.100.69 with HTTP; Sun, 20 Jun 2010 06:02:10 -0700 (PDT) In-Reply-To: <001401cb1077$5159bfa0$0202a8c0@laptopcore2> References: <001401cb1077$5159bfa0$0202a8c0@laptopcore2> Date: Sun, 20 Jun 2010 14:02:10 +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: Re: 500kHz earth electrode loop - further testing today with step-up transformer Content-Type: multipart/alternative; boundary=0016e6db2cd3d3fb55048975cbdd X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_40_50, HTML_FONTCOLOR_UNKNOWN,HTML_FONTCOLOR_UNSAFE,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-m239.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d41164c1e1186271a X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0016e6db2cd3d3fb55048975cbdd Content-Type: text/plain; charset=ISO-8859-1 Eddie, At 12.34 I was using the smallest loop i.e. the connection to the radiator and the ground rod outside the back door. At 12.58 I've reverted to the large "loop in the ground" with the earth rod at the far end of the garden and the central heating radiator connection. 73s Roger G3XBM On 20 June 2010 13:51, g3zjo wrote: > Roger > > > > What were you using at 12:34.? I see a faint trace of your transmission, > no decode. > > > > BTW the Panasonic Plasma noise has gone off and yes I checked the drive, > the car has gone. > > > > *Eddie* > > > > -----Original Message----- > *From:* owner-rsgb_lf_group@blacksheep.org [mailto: > owner-rsgb_lf_group@blacksheep.org] *On Behalf Of *Roger Lapthorn > *Sent:* 20 June 2010 12:36 > *To:* rsgb_lf_group@blacksheep.org > *Subject:* LF: Re: 500kHz earth electrode loop - further testing today > with step-up transformer > > > > Some very interesting results so far, but still not tried a step up > transformer as the ones I've tried got hot. > > Just tried this... > > I've an earth rod just outside the back of the house, so I connected one > end of the 500kHz TX to this ground rod and disconnected completely the wire > to the ground rod down the far end of the garden. The other end of the loop > was connected to the copper central heating radiator as before. The length > of wire to the "outside the back door" ground is at most 7m long over the > flat roof and down to the rod. What happened? Current in the loop is up > 20%, voltage is down 20% but I'm still being received by M0BMU and G0KTN > (210km) with S/N within 2dB of the earlier "larger loop in the ground" set > up! > > > So, what IS going on? Effectively all I have now is a short wire going to a > ground rod outside the back door and the other end to the radiator, yet 5W > from my 500kHz transverter is STILL getting halfway across England! > > I'm now more puzzled than before why this arrangement works at all, let > alone so well. > > 73s > Roger G3XBM > > > On 20 June 2010 10:23, Roger Lapthorn wrote: > > In the next few hours I've a new experiment on 500kHz WSPR using my earth > electrode "loop". > > A small step-up transformer should allow me to better match the earth loop > and therefore increase the ERP some 4-6dB. To make a valid test I'll run the > beacon for periods with and without the step-up transformer to see if a > clear pattern emerges. You'll have to guess which is which. > > So, (as always) I'll much appreciate any 500kHz WSPR reports today. > > 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 > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0016e6db2cd3d3fb55048975cbdd Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Eddie,

At 12.34 I was using the smallest loop i.e. the connection= to the radiator and the ground rod outside the back door.

At 12.5= 8 I've reverted to the large "loop in the ground" with the= earth rod at the far end of the garden and the central heating radiator= connection.

73s
Roger G3XBM

On 20 June 2010= 13:51, g3zjo <g3zjo@npton.plus.com> wrote:

Roger=

=A0

What were yo= u using at 12:34.? =A0I see a faint trace of your transmission, no decode.

=A0

BTW the Pana= sonic Plasma noise has gone off and yes I checked the drive, the car has gone.

=

=A0

Eddie

=A0

-----Original Message-----
From: owner-rsgb_lf_group@b= lacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roger Lapthorn
Sent: 20 June 2010 12:36<= br> To: rsgb_lf_group@blacksheep.org<= /a>
Subject: LF: Re: 500kHz= earth electrode loop - further testing today with step-up transformer

=A0

Some very interesting results so far, but still not tried a step up transformer= as the ones I've tried got hot.

Just tried this...

I've an earth rod= just outside the back of the house, so I connected one end of the 500kHz TX to= this ground rod and disconnected completely the wire to the ground rod down the= far end of the garden. The other end of the loop was connected to the copper central heating radiator as before. The length of wire to the "outsid= e the back door" ground is at most 7m long over the flat roof and down to= the rod. What happened? Current in the loop is up 20%,=A0 voltage is down 20% but I'm still being received by M0BMU and G0KTN (210km) with S/N withi= n 2dB of the earlier "larger loop in the ground" set up!


So, what IS going on? Effectively all I have now is a short wire going to= a ground rod outside the back door and the other end to the radiator, yet 5W= from my 500kHz transverter is STILL getting halfway across England!

I'm now more puzzled than before why this arrangement works at all, le= t alone so well.

73s
Roger G3XBM


On 20 June 2010 10:23= , Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

In the next few hours I've a new experiment on 500kHz WSPR using my earth electrode "lo= op".

A small step-up transformer should allow me to better match the earth loop= and therefore increase the ERP some 4-6dB. To make a valid test I'll run= the beacon for periods with and without the step-up transformer to see if a clear pat= tern emerges. You'll have to guess which is which.

So, (as always) I'll much appreciate any 500kHz WSPR reports today.
73s
Roger G3XBM

--
http://g3xbm-= qrp.blogspot.com/
http://www.g3xbm.co.u= k
http://www= .youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<= /p>




--
http://g3xbm-= qrp.blogspot.com/
http://www.g3xbm.co.u= k
http://www= .youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL 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
--0016e6db2cd3d3fb55048975cbdd--