Return-Path: Received: from mtain-di11.r1000.mx.aol.com (mtain-di11.r1000.mx.aol.com [172.29.64.15]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4c1e0f173bb; Sun, 20 Jun 2010 08:52:39 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9899A380000A4; Sun, 20 Jun 2010 08:52:36 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OQK04-0006Dc-2O for rs_out_1@blacksheep.org; Sun, 20 Jun 2010 13:51:48 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OQK03-0006DR-Gc for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 13:51:47 +0100 Received: from out1.ip03ir2.opaltelecom.net ([62.24.128.239]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OQK00-0004l9-2U for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 13:51:47 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Av0EAJ2rHUxOlJWQ/2dsb2JhbACBQp1Icb9MhRsE X-IronPort-AV: E=Sophos;i="4.53,447,1272841200"; d="scan'208,217";a="308673458" Received: from unknown (HELO laptopcore2) ([78.148.149.144]) by out1.ip03ir2.opaltelecom.net with ESMTP; 20 Jun 2010 13:51:36 +0100 From: "g3zjo" To: Date: Sun, 20 Jun 2010 13:51:35 +0100 Message-ID: <001401cb1077$5159bfa0$0202a8c0@laptopcore2> MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2616 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 Importance: Normal In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: Re: 500kHz earth electrode loop - further testing today with step-up transformer Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01CB107F.B31E27A0" 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-sid: 3039ac1d400f4c1e0f145603 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0015_01CB107F.B31E27A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 ------=_NextPart_000_0015_01CB107F.B31E27A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Roger

 

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

 

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

 

Eddie

 

-----Original Message-----
From: owner-rsgb_lf_gro= up@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roger Lapthorn
Sent: 20 June 2010 12:3= 6
To: rsgb_lf_group@black= sheep.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 transfo= rmer as the ones I've tried got hot.

Just tried this...

I've an earth ro= d 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 copp= er central heating radiator as before. The length of wire to the "ou= tside 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 do= wn 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, ye= t 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 <rogerlap= thorn@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= 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://g3= xbm-qrp.blogspot.com/
http://www.g3xbm.= co.uk
http:/= /www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088




--
http://g3xbm-qrp.blogspot.c= om/
http://www.g3xbm.co.uk
http://www.youtube.com/u= ser/g3xbm
G3XBM    GQRP 1678      ISWL G11088

------=_NextPart_000_0015_01CB107F.B31E27A0--