Return-Path: Received: from mtain-mg05.r1000.mx.aol.com (mtain-mg05.r1000.mx.aol.com [172.29.96.205]) by air-dc05.mail.aol.com (v129.10) with ESMTP id MAILINDC051-86014db8741b255; Wed, 27 Apr 2011 15:52:59 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id BA38738000103; Wed, 27 Apr 2011 15:52:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QFAmM-0008De-9a for rs_out_1@blacksheep.org; Wed, 27 Apr 2011 20:52:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QFAmL-0008DV-OI for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 20:52:05 +0100 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QFAmJ-0005qB-7u for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 20:52:05 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApEBAJ9zuE1Olm8n/2dsb2JhbAAM6xGFdgSSf4l/ X-IronPort-AV: E=Sophos;i="4.64,275,1301871600"; d="scan'208,217";a="487278185" Received: from unknown (HELO [192.168.2.2]) ([78.150.111.39]) by out1.ip07ir2.opaltelecom.net with ESMTP; 27 Apr 2011 20:51:56 +0100 Message-ID: <4DB873DB.500@talktalk.net> Date: Wed, 27 Apr 2011 20:51:55 +0100 From: qrss User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4DB8535B.7040903@talktalk.net> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: More 8.97kHz WSPR decodes - changed PC here Content-Type: multipart/alternative; boundary="------------060509030301060503020301" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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: 3039ac1d60cd4db8741949e1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------060509030301060503020301 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Just a further thought. WSPR doesn't of course spread its power over 6Hz it actually transmits full carrier on each of the four frequencies for 0.682 mS and sometimes several of the same element follow without a break in carrier, which accounts for some of the bright spots and lines we see when things are marginal. One element is a longer dot time than 2WPM Morse, and that is SLOW Morse. Long integration times are out of course. 73 Eddie G3ZJO On 27/04/2011 18:58, Roger Lapthorn wrote: > 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/ > --------------060509030301060503020301 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Just a further thought. WSPR doesn't of course spread its power over 6Hz it actually transmits full carrier on each of the four frequencies for 0.682 mS and sometimes several of the same element follow without a break in carrier, which accounts for some of the bright spots and lines we see when things are marginal. One element is a longer dot time than 2WPM Morse, and that is SLOW Morse.
Long integration times are out of course.

73 Eddie G3ZJO
 
On 27/04/2011 18:58, Roger Lapthorn wrote:
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 <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 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/


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