Envelope-to: dave@picks.force9.co.uk Delivery-date: Sat, 05 Nov 2005 23:18:47 +0000 Received: by pih-mxcore06.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1EYXJ7-0007fX-E2 for dave@picks.force9.co.uk; Sat, 05 Nov 2005 23:18:46 +0000 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore06.plus.net with esmtp (PlusNet MXCore v2.00) id 1EYXJ7-0007fP-9O for dave@picks.force9.co.uk; Sat, 05 Nov 2005 23:18:45 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1EYXIf-00017g-4x for rs_out_1@blacksheep.org; Sat, 05 Nov 2005 23:18:17 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1EYXIe-00017X-JQ for rsgb_lf_group@blacksheep.org; Sat, 05 Nov 2005 23:18:16 +0000 Received: from smtp800.mail.ukl.yahoo.com ([217.12.12.142]) by relay2.thorcom.net with smtp (Exim 4.51) id 1EYYNc-0003Tc-FS for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2005 00:27:29 +0000 Received: (qmail 35460 invoked from network); 5 Nov 2005 23:18:09 -0000 Received: from unknown (HELO Dell5150) (davepick@btinternet.com@86.137.56.21 with login) by smtp800.mail.ukl.yahoo.com with SMTP; 5 Nov 2005 23:18:09 -0000 From: "Dave Pick" To: rsgb_lf_group@blacksheep.org Date: Sat, 5 Nov 2005 23:18:12 -0000 Message-ID: <003b01c5e25f$31822370$f500a8c0@Dell5150> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: <25f.461d5c.309e866b@aol.com> Thread-Index: AcXiVQJhyrlct41wTAyB3QEVJDAlvwACbg/Q Subject: RE: LF: Fuzzy lines Content-Type: text/html; charset=windows-1252 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Content-transfer-encoding: 8bit

Markus

Interesting. The frequencies are right. I could understand the Rugby one because that's loud here but neither DCF39 nor Lessay are loud enough to intermod locally so where does that product get generated?

Dave G3YXM

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of MarkusVester@aol.com
Sent: 05 November 2005 22:04
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Fuzzy lines

Dear Dave and LF,

this seems to be an intermodulation between DCF39 (abt 0.1Hz wide due to the data telegrams every 10s) and Loran C. The lines in you screenshot are
138830.03 - 142 * 50000 / 6731 = 137775.21 (Lessay, Soustons, Sylt, Rugby) and
138830.03 - 158 * 50000 / 7499 = 137776.56 (Sylt, Lessay, Verlandet).
The latter one is a little surprising because Rugby does not appear to be dual rated.

Laurence KL1X saw similar DCF ghosts in December 2003, which appeared every time the path was open from Germany to Alaska. For a while we speculated about possible ionospheric crossmodulation, but then Laurence confirmed that the spurs were caused by periodic triggering of his noise blanker on the Pacific Loran pulses. We also found a faint hint of a Sylt + DCF39 combination in one of Alan's screenshots.

Hope this helps...

73 de Markus, DF6NM

In einer eMail vom 05.11.2005 21:03:36 Westeuropäische Normalzeit schreibt dave@picks.force9.co.uk:

Dear all

Myself and Gary G4WGT both see these fuzzy lines on Argo. I seem to remember
some discussion of their origin before but can't remember whether there was
a definite answer.
The come in at dusk and stay 'till dawn!

73
Dave G3YXM.