Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w2V9wtPx008002 for ; Sat, 31 Mar 2018 11:58:58 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f2DCC-00050A-8w for rs_out_1@blacksheep.org; Sat, 31 Mar 2018 10:53:12 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f2DCA-000501-OQ for rsgb_lf_group@blacksheep.org; Sat, 31 Mar 2018 10:53:10 +0100 Received: from omr-a015e.mx.aol.com ([204.29.186.63]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1f2DC3-0005wy-83 for rsgb_lf_group@blacksheep.org; Sat, 31 Mar 2018 10:53:09 +0100 Received: from mtaomg-aah02.mx.aol.com (mtaomg-aah02.mx.aol.com [172.27.1.144]) by omr-a015e.mx.aol.com (Outbound Mail Relay) with ESMTP id 237D93800082 for ; Sat, 31 Mar 2018 05:52:59 -0400 (EDT) Received: from core-acd05f.mail.aol.com (core-acd05.mail.aol.com [172.27.22.15]) by mtaomg-aah02.mx.aol.com (OMAG/Core Interface) with ESMTP id BC45B38000081 for ; Sat, 31 Mar 2018 05:52:58 -0400 (EDT) Received: from 188.194.222.230 by webjasstg-vab46.srv.aolmail.net (10.96.25.113) with HTTP (WebMailUI); Sat, 31 Mar 2018 05:52:58 -0400 Date: Sat, 31 Mar 2018 05:52:58 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <1627b796e6a-1799-c0@webjasstg-vab46.srv.aolmail.net> In-Reply-To: References: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1522489979; bh=2u6CN/CrzmIgKsZxsI6ojEVSGVMHCyhC5fxj+kIPjv8=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=7EdPmHDjBATwMcnkBnO7y6IPHFqu1vNIPuWw0G5/+6i5CfEbymwET+tkXVl5OCBMm bf5qQCJPmTAQScBNY7FDsdH9kKN0zyl/vARUAiGNYZmR10yNbtQPxC9EBliJfotqa8 4s7zgtMteUbW0eFEwf+JBHWvIAZIkHGtdwHVT/Eg= x-aol-sid: 3039ac1b01905abf5a7a5407 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Andy, LF, the frequency offset on the Loran signal has been present since Friday (Mar 24). It showed up as a rainbow pattern on my monitor http://df6nm.bplaced.net/LoranView/LoranGrabber.htm and was immediately confirmed by Peter G3PLX, who then communicated the problem to the ooperators. It looks like the frequency offset is alternating between exactly +1ppb and -1ppb, as if a digital timing control unit were going rail-to-rail while attempting to to lock to the proper time. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 34d483c57c7a6bf26c25db3c8765d5fc Subject: Re: LF: More Phase plots Content-Type: multipart/alternative; boundary="----=_Part_210_1382949416.1522489978474" 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 ------=_Part_210_1382949416.1522489978474 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Andy, LF, the frequency offset on the Loran signal has been present since Friday (Mar= 24). It showed up as a rainbow pattern on my monitor http://df6nm.bplaced.net/LoranView/LoranGrabber.htm and was immediately confirmed by Peter G3PLX, who then communicated the pro= blem to the ooperators. It looks like the frequency offset is alternating b= etween exactly +1ppb and -1ppb, as if a digital timing control unit were go= ing rail-to-rail while attempting to to lock to the proper time. Peter had discovered a similar phase-drift fault already in August 2016. Th= is was later fixed, but has left a permanent timing error on the master pul= segroup (on LoranView the trace is slightly left of it's.slot) Andy did you actually undo the Loran pulse phasecodes for your measurement,= or simply look at the 100.000 kHz spectral line which results from the unb= alance of the phasecode scheme (ratio of 11 to 7 positive to negative pulse= s for master, 10 to 6 for secondary) ?=20 Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Andy Talbot An: LineOne ; rsgb_lf_group Verschickt: Sa, 31. Mrz 2018 9:40 Betreff: LF: More Phase plots While I'm still on a roll with high stability off-air monitoring, here is a= plot of the one remaining 100kHz transmission, from Anthorn, taken overni= ght. =20 http://www.g4jnt.com/DropF/clipboard_201803310831.png It has been reported by a few amateurs that this is exhibiting a 1 PPB freq= uency error, and that is clearly visible on my plot. The rest of the wobbl= es are multipath. Although a pulsed signal, when filtered to a narrow-eno= ugh bandwidth a stable spectral line at [exactly] 100kHz appears. There is some quite spectacular fading Andy G4JNT ------=_Part_210_1382949416.1522489978474 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Andy, LF,

the frequency offs= et on the Loran signal has been present since Friday (Mar 24). It= showed up as a rainbow pattern on my monitor
http://df6nm.bplaced.net/L= oranView/LoranGrabber.htm
and was immediately confirmed by Peter G3PLX, = who then communicated the problem to the ooperators. It looks like the freq= uency offset is alternating between exactly +1ppb and -1ppb, as if a digita= l timing control unit were going rail-to-rail while attempting to= to lock to the proper time.

Peter had discovered a similar pha= se-drift fault already in August 2016. This was later fixed, but has left a= permanent timing error on the master pulsegroup (on LoranView the trace is= slightly left of it's.slot)

Andy did you actually undo the Loran pu= lse phasecodes for your measurement, or simply look at = the 100.000 kHz spectral line which results from the unbalance of= the phasecode scheme (ratio of 11 to 7 positive to negative pulses for mas= ter, 10 to 6 for secondary) ? 

Best 73,
Markus (DF6NM)<= br>
-----Urspr=C3=BCngliche Mitteilung-----
Von: Andy Talbot <andy.g4jnt@gmail.com>
An: LineOne= <rsgb_lf_group@blacksheep.org>; rsgb_lf_group <rsgb_lf_group@yaho= ogroups.co.uk>
Verschickt: Sa, 31. Mrz 2018 9:40
Betreff: LF: More Phase plots

<= br abp=3D"2707">
While I'm s= till on a roll with high stability off-air monitoring, here is a plot of th= e one remaining 100kHz  transmission, from Anthorn, taken overnight.&n= bsp; 

http://www.g4jnt.com/DropF/clipboard_201= 803310831.png

It has been reported by a few amateurs that this is exhibiting a = 1 PPB frequency error, and that is clearly visible on my plot.  The re= st of the wobbles are multipath.   Although a pulsed signal, when= filtered to a narrow-enough bandwidth a stable spectral line at [exactly] = 100kHz appears.

There is s= ome quite spectacular fading

Andy  G4JNT




 
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