Return-Path: Received: (qmail 1484 invoked from network); 31 Dec 2000 10:42:28 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 31 Dec 2000 10:42:28 -0000 Received: (qmail 12610 invoked from network); 31 Dec 2000 10:37:13 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 31 Dec 2000 10:37:13 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14Cfm0-0000FM-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 31 Dec 2000 10:31:32 +0000 Received: from fm215.facility.pipex.com ([194.131.104.225]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14Cflz-0000FH-00 for rsgb_lf_group@blacksheep.org; Sun, 31 Dec 2000 10:31:31 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from 233.pncl.co.uk (248.234.35.212.in-addr.arpa.ip-pool.cix.co.uk [212.35.234.248]) by fm215.facility.pipex.com (8.9.3/8.9.3) with ESMTP id KAA15122 for ; Sun, 31 Dec 2000 10:27:17 GMT Message-ID: <5.0.2.1.2.20001231101949.00a71ec0@mail.pncl.co.uk> X-Sender: blanch@mail.pncl.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Sun, 31 Dec 2000 10:31:12 +0000 To: rsgb_lf_group@blacksheep.org From: "Walter Blanchard" Subject: LF: DCF spurious analysis In-reply-to: <82.4ebf8ca.277f4842@aol.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: At 14:16 30/12/00 Saturday, Markus wrote: >................Which of course brings up the matter of Loran lines. >At my qth, I do see some >in the upper part of the band, but below 137 kHz the noise appears to be >higher, and they are quite faint if visible at all. Looking around in the >neighbourhood of 100.0 kHz revealed three sets with periodicies of 5.5, 6.7 >and 7.5 Hz. They happen to peak around 137 kHz for some reason. A spectrum plot will show a dip around 125 kHz and a tail-off after 141 kHz. Are your periodicities right? Your local Loran is Sylt which double-rates at GRI 67310 uS (14.856633 Hz) and 74990 uS (13.335111 Hz) presumably giving you the "7.5" and "6.7" sets you mention. The third one "5.5" is about 11 Hz if doubled and corresponds to GRI 90070 (11.102476 Hz) which has a station at Vaerlandet (near enough Bergen) probably the one you see. They all switch phase between successive GRI's - maybe this is having an effect. Walter G3JKV.