Return-Path: Received: from mtain-md01.r1000.mx.aol.com (mtain-md01.r1000.mx.aol.com [172.29.96.85]) by air-mb03.mail.aol.com (v129.10) with ESMTP id MAILINMB034-a21f4db859b737e; Wed, 27 Apr 2011 14:00:23 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0C8E9380000C6; Wed, 27 Apr 2011 14:00:09 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QF90F-0007FO-PP for rs_out_1@blacksheep.org; Wed, 27 Apr 2011 18:58:19 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QF90F-0007FF-7Q for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 18:58:19 +0100 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QF90C-0003o3-Ah for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 18:58:19 +0100 Received: by iyi20 with SMTP id 20so2463121iyi.16 for ; Wed, 27 Apr 2011 10:58:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=oiD9BiI5ovog8D+2+tikFU5snyxJD5okYP4hMDYk+IA=; b=GAFsoMo3hEBJV0FespvxFwNxrACzoHJoaJA7b53RovNIleQ3dhiih1JIK/e9On0f9w fesSf5bJa1wJoXX26Ox/wF5Te9g8qAJVnNz6PITy7Zp7P7pzS5nGlppXR2yzjL+07E0I IJ2acReSMBNxm6W3BS2bZT0vLJKH47yEiOe9w= 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=X1ItwYQtb41SZksSoyIb748S1xM31qcpK4Mjx1xeHe8FBrFcJqFDnkIaNPzUiMF00N /3LzyekX9hgi0yPcxhDG/fzhJxRPTa8fHR9pVwI6tds5mA0/IeY7GYxe3FJCnO8fCS4S IMA81CciX1HB+fWqrXvzqNS30F7X41FZgpNjc= MIME-Version: 1.0 Received: by 10.42.168.6 with SMTP id u6mr3242529icy.46.1303927089553; Wed, 27 Apr 2011 10:58:09 -0700 (PDT) Received: by 10.42.221.133 with HTTP; Wed, 27 Apr 2011 10:58:09 -0700 (PDT) In-Reply-To: <4DB8535B.7040903@talktalk.net> References: <4DB8535B.7040903@talktalk.net> Date: Wed, 27 Apr 2011 18:58:09 +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: More 8.97kHz WSPR decodes - changed PC here Content-Type: multipart/alternative; boundary=90e6ba6e8d06fc621204a1ea2e8c X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE,LINES_OF_YELLING 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-m004.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60554db859a92fea X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --90e6ba6e8d06fc621204a1ea2e8c Content-Type: text/plain; charset=ISO-8859-1 Hi Eddie (et al) It is highly unlikely you'd copy Andrew on VLF remembering that the WSPR signal spreads around 6Hz in the transmission burst, so the energy in any narrow FFT bin would be tiny. Also, this is earth mode (I hope, as G6ALB does not hold an NoV to radiate at VLF), so signals are propagating through the ground by conduction and no significant amount of signal is radiated. I'm still intrigued why the best reception here today was with my 80sq m vertical loop. This outperformed several earth electrode set-ups here at the RX end, an E-field probe and a 30t loop laying close to copper pipe work in the house! If the signals are coming down the pipes then why don't these more direct means of coupling to them work as well as (or better than) a vertical loop outside? Odd. 73s Roger G3XBM On 27 April 2011 18:33, qrss wrote: > Great stuff Roger and Andrew > > If you are RX'ing on an 80m dipole it may be worth a look here, I would > never say can't until I have tried. Bearing in mind I should be able to > observe signals which would not be decode able on WSPR > > I would appreciate a prior notification of times and exact frequency of the > WSPR signal of any further tests. > > Keep it up. > > 73 Eddie G3ZJO > > > On 27/04/2011 15:19, Roger Lapthorn wrote: > >> As an experiment I changed over to my wife's laptop and got immediate >> decodes of G6ALB's VLF earth mode signal (3km) at -17dB S/N, suggesting the >> issue with lack of decodes may be with my soundcard and not Andrew's. >> >> 1408 -17 -0.6 0.008986 0 G6ALB JO02 47 >> 1410 -17 -0.6 0.008986 0 G6ALB JO02 47 >> 1412 -17 -1.2 0.008986 0 G6ALB JO02 47 >> 1414 -17 -0.8 0.008986 0 G6ALB JO02 47 >> 1416 -17 -0.8 0.008986 0 G6ALB JO02 47 >> >> This is a very solid signal on the 80m square single turn vertical wire >> loop antenna. Andrew is using 44W to an earth electrode antenna. >> >> 73s >> Roger G3XBM >> >> -- >> http://g3xbm-qrp.blogspot.com/ >> http://www.g3xbm.co.uk >> http://www.youtube.com/user/g3xbm >> https://sites.google.com/site/sub9khz/ >> >> > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm https://sites.google.com/site/sub9khz/ --90e6ba6e8d06fc621204a1ea2e8c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Eddie (et al)

It is highly unlikely you'd copy Andrew on VLF= remembering that the WSPR signal spreads around 6Hz in the transmission= burst, so the energy in any narrow FFT bin would be tiny. Also, this is= earth mode (I hope, as G6ALB does not hold an NoV to radiate at VLF), so= signals are propagating through the ground by conduction and no significa= nt amount of signal is radiated.

I'm still intrigued why the best reception here today was with my= 80sq m vertical loop. This outperformed several earth electrode set-ups= here at the RX end, an E-field probe and a 30t loop laying close to coppe= r pipe work in the house!=A0 If the signals are coming down the pipes then= why don't these more direct means of coupling to them work as well as= (or better than) a vertical loop outside? Odd.

73s
Roger G3XBM



On 27 Apr= il 2011 18:33, qrss <qrss@talktalk.net> wrote:
Great stuff Roger and Andrew

If you are RX'ing on an 80m dipole it may be worth a look here, I woul= d never say can't until I have tried. Bearing in mind I should be able= to observe signals which would not be decode able on WSPR

I would appreciate a prior notification of times and exact frequency of th= e WSPR signal of any further tests.

Keep it up.

73 Eddie G3ZJO


On 27/04/2011 15:19, Roger Lapthorn wrote:
As an experiment I changed over to my wife's laptop and got immediate= decodes of G6ALB's VLF earth mode signal (3km) at -17dB S/N, suggesti= ng the issue with lack of decodes may be with my soundcard and not Andrew&= #39;s.

1408 -17 -0.6 =A0 0.008986 =A00 G6ALB JO02 47
1410 -17 -0.6 =A0 0.008986 =A00 G6ALB JO02 47
1412 -17 -1.2 =A0 0.008986 =A00 G6ALB JO02 47
1414 -17 -0.8 =A0 0.008986 =A00 G6ALB JO02 47
1416 -17 -0.8 =A0 0.008986 =A00 G6ALB JO02 47

This is a very solid signal on the 80m square single turn vertical wire lo= op antenna. Andrew is using 44W to an earth electrode antenna.

73s
Roger G3XBM

--
http://g3xbm-= qrp.blogspot.com/
http://www.g3xbm.co.u= k
http://www= .youtube.com/user/g3xbm
https= ://sites.google.com/site/sub9khz/






--
http://g3xbm-qrp.blogsp= ot.com/
http:/= /www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/
--90e6ba6e8d06fc621204a1ea2e8c--