Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 208CF38000110; Thu, 1 Sep 2011 18:25:06 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QzFgO-0004vy-Pw for rs_out_1@blacksheep.org; Thu, 01 Sep 2011 23:24:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QzFgO-0004vp-Ah for rsgb_lf_group@blacksheep.org; Thu, 01 Sep 2011 23:24:24 +0100 Received: from imr-mb02.mx.aol.com ([64.12.207.163]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QzFgK-0001lj-Op for rsgb_lf_group@blacksheep.org; Thu, 01 Sep 2011 23:24:24 +0100 Received: from mtaout-ma04.r1000.mx.aol.com (mtaout-ma04.r1000.mx.aol.com [172.29.41.4]) by imr-mb02.mx.aol.com (8.14.1/8.14.1) with ESMTP id p81MOCoL024671 for ; Thu, 1 Sep 2011 18:24:12 -0400 Received: from White (nrbg-4dbe4151.pool.mediaWays.net [77.190.65.81]) by mtaout-ma04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id CEA35E0000A2 for ; Thu, 1 Sep 2011 18:24:11 -0400 (EDT) Message-ID: <7D58C8CBA6BE417FB14240FC5573B75C@White> From: "Markus Vester" To: Date: Fri, 2 Sep 2011 00:24:20 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-AOL-SCOLL-SCORE: 0:2:473764416:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: Microhertzing at LF: Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01CC6906.A8628190" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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-SCORE: 0:2:494081600:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4ad14e6006427ca5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0018_01CC6906.A8628190 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable trying again... From: Markus Vester=20 Sent: Thursday, September 01, 2011 10:47 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: Microhertzing at LF: Hi Chris, thanks for this! The Saudi Loran traces (GRI 8830) look very accurate on = your 4X grabber. I will try to appear there tonight, and have started to = send a straight carrier on 137780.30. TX power is now reduced to about = 100 mW EMRP. Best 73, Markus From: Chris 4X1RF=20 Sent: Thursday, September 01, 2011 1:34 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: Microhertzing at LF: Markus, LF, As a newcomer to LF I find this as an interesting experiment for real = low power or long distance tests for those who can achieve the necessary = frequency stability requirements. I found this to be quite a = challenge... I have followed your initiative and started similar windows on my = grabbers in YO: http://dl.dropbox.com/u/10280270/YO/TA3600.jpg and 4X: = http://dl.dropbox.com/u/10280270/4X/TA3600.jpg The 4X grabber is currently using the Mercury HPSDR receiver = (http://openhpsdr.org) which is GPSDO locked. However, the audio is = routed to SpectrumLab using Virtual Audio Cable as a virtual sound card. = I have no info regarding VAC sample rate accuracy or how I can = automatically adjust it so this may be a limiting factor, further = experimentation is needed. In the worst case, a real sound card could be = used but then it also has to be locked to GPS. The YO grabber is usually using GQD as a reference for the sound card = sample rate calibration in SpectrumLab and the LF receiver is based on a = laboratory grade VTCXO. GQD being off air, I was forced to use DHO which = is not very reliable during the night for me as can be seen on the = 137.775 Loran line. Thanks for the challenge! 73s Chris 4X1RF ... ------=_NextPart_000_0018_01CC6906.A8628190 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
trying again...

Sent: Thursday, September 01, 2011 10:47 PM
Subject: Re: Microhertzing at LF:

Hi Chris,
 
thanks for this! The Saudi Loran traces = (GRI 8830)=20 look very accurate on your 4X grabber. I will try to appear there = tonight, and=20 have started to send a straight carrier on 137780.30. TX = power is now=20 reduced to about 100 mW EMRP.
 
Best = 73,
Markus

From: Chris 4X1RF
Sent: Thursday, September 01, 2011 1:34 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: Microhertzing at LF:

Markus, LF,

As a newcomer to LF I find this as an=20 interesting experiment for real low power or long distance tests for = those who=20 can achieve the necessary frequency stability requirements. I found this = to be=20 quite a challenge...

I have followed your initiative and started = similar=20 windows on my grabbers in YO: http://dl.dropbox= .com/u/10280270/YO/TA3600.jpg=20 and 4X: http://dl.dropbox= .com/u/10280270/4X/TA3600.jpg

The=20 4X grabber is currently using the Mercury HPSDR receiver (http://openhpsdr.org) which is GPSDO = locked.=20 However, the audio is routed to SpectrumLab using Virtual Audio Cable as = a=20 virtual sound card. I have no info regarding VAC sample rate accuracy or = how I=20 can automatically adjust it so this may be a limiting factor, further=20 experimentation is needed. In the worst case, a real sound card could be = used=20 but then it also has to be locked to GPS.

The YO grabber is = usually using=20 GQD as a reference for the sound card sample rate calibration in = SpectrumLab and=20 the LF receiver is based on a laboratory grade VTCXO. GQD being off air, = I was=20 forced to use DHO which is not very reliable during the night for me as = can be=20 seen on the 137.775 Loran line.

Thanks for the=20 challenge!


73s
Chris 4X1RF

...
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