Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 185BD380001F4; Fri, 2 Sep 2011 05:39:21 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QzQCk-00013a-5U for rs_out_1@blacksheep.org; Fri, 02 Sep 2011 10:38:30 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QzQCj-00013R-KZ for rsgb_lf_group@blacksheep.org; Fri, 02 Sep 2011 10:38:29 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QzQCh-00053T-9q for rsgb_lf_group@blacksheep.org; Fri, 02 Sep 2011 10:38:29 +0100 Received: by bkbzv15 with SMTP id zv15so3814749bkb.16 for ; Fri, 02 Sep 2011 02:38:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=39UGEHNfk/tFbpJfPKvMl5fWq7CX0yfGZvo+ULlHZaU=; b=PbrvNzkVx58mWRxfwo7gFPjsl5vlpwttcp4Lx+Cf8uRD0ae6bbNapRWwVJIDfyhiAY R9CEM7mSgHwwgt8yKgZ1opMvV+v4tqKvWrj+9KhQIRkzr/mRjQpkidnc06HjepH9XlVn Pg/ahs0L0sSb9naxK+MADvaNVNEq+jqqnyJBk= MIME-Version: 1.0 Received: by 10.204.128.130 with SMTP id k2mr483904bks.322.1314956301128; Fri, 02 Sep 2011 02:38:21 -0700 (PDT) Received: by 10.204.115.83 with HTTP; Fri, 2 Sep 2011 02:38:21 -0700 (PDT) In-Reply-To: <7D58C8CBA6BE417FB14240FC5573B75C@White> References: <7D58C8CBA6BE417FB14240FC5573B75C@White> Date: Fri, 2 Sep 2011 12:38:21 +0300 Message-ID: From: Chris 4X1RF To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: Microhertzing at LF: Content-Type: multipart/alternative; boundary=0015174c0f7639548404abf21f7d X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-SCORE: 0:2:504796896:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m025.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d40814e60a4491b35 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --0015174c0f7639548404abf21f7d Content-Type: text/plain; charset=ISO-8859-1 Markus, LF, Your night long transmission appeared nicely in Haifa http://dl.dropbox.com/u/10280270/4x1rf_DF6NM_QRSS3600_2sept2011.jpg and Bucharest http://dl.dropbox.com/u/10280270/YO/yo4x1rf_DF6NM_QRSS3600_2sept2011.jpg There's room left for using much less power. Based on last night results, a 1mW EMRP from you should be about the same level as the 137780.29445 Loran trace in Haifa. It was a good opportunity to test both receivers, looking forward to further tests. 73s Chris 4X1RF On Fri, Sep 2, 2011 at 1:24 AM, Markus Vester wrote: > ** > trying again... > > *From:* Markus Vester > *Sent:* Thursday, September 01, 2011 10:47 PM > *To:* rsgb_lf_group@blacksheep.org > *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 > *Sent:* Thursday, September 01, 2011 1:34 PM > *To:* rsgb_lf_group@blacksheep.org > *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 > > ... > --0015174c0f7639548404abf21f7d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Markus, LF,

Your night long transmission appeared n= icely in Haifa http://dl.dropbox.com/u/10280270/4x1rf_DF6NM_QRSS3600_2= sept2011.jpg
and Bucharest http://dl.dropbox.com/u/10280270/YO/yo4x1rf_DF6NM_Q= RSS3600_2sept2011.jpg

There's room left for using much less = power. Based on last night results, a 1mW EMRP from you should be about the= same level as the 137780.29445 Loran trace in Haifa. It was a good opportu= nity to test both receivers, looking forward to further tests.


73s
Chris 4X1RF



On Fri= , Sep 2, 2011 at 1:24 AM, Markus Vester <markusvester@aol.com> wrote:
trying again...

Hi Chris,
=A0
thanks for this! The Saudi Loran trace= s (GRI 8830)=20 look very accurate on your 4X grabber. I will try to appear there tonight, = and=20 have started=A0to send a straight carrier on 137780.30. TX power=A0is now= =20 reduced to about=A0100 mW EMRP.
=A0
Best 73,
Markus

Sent: Thursday, September 01, 2011 1:34 PM
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 sim= ilar=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 ho= w 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 us= ed=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 SpectrumLa= b 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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