Return-Path: Received: (qmail 7494 invoked from network); 27 Feb 1999 00:22:13 -0000 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by medusa.plus.net.uk with SMTP; 27 Feb 1999 00:22:13 -0000 Received: (qmail 31650 invoked from network); 27 Feb 1999 00:23:32 -0000 Received: from post.thorcom.com (194.75.130.70) by magnet.plus.net.uk with SMTP; 27 Feb 1999 00:23:32 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10GXXv-0002VU-00; Sat, 27 Feb 1999 00:23:55 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id AAA14234 for rsgb_lf_group-outgoing; Sat, 27 Feb 1999 00:19:42 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id AAA14117 for ; Sat, 27 Feb 1999 00:16:57 GMT X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from irwell.zetnet.co.uk ([194.247.47.48] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10GXUl-0002Sh-00 for rsgb_lf_group@blacksheep.org; Sat, 27 Feb 1999 00:20:40 +0000 Received: from central.zetnet.co.uk (central.zetnet.co.uk [194.247.47.20]) by irwell.zetnet.co.uk (8.8.7/8.8.5) with SMTP id AAA31416 for ; Sat, 27 Feb 1999 00:16:53 GMT X-ZSender: g3ldo@zetnet.co.uk Message-ID: <1999022700200968199@zetnet.co.uk> Date: Sat, 27 Feb 1999 00:20:09 GMT To: rsgb_lf_group@blacksheep.org From: "Peter Dodd" X-Mailer: ZIMACS Version 1.20c 10000836 Subject: LF: Reading between the lines Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit In the past I have complained a lot about Loran, which is quite strong here on the South Coast. Viewing the band using Spectogram shows that within the bandwidth of the narrowest CW filter there may be 18 or 20 Loran sidebands. Each individual sideband is not that strong but is about the same as an O report slow CW signal. Some time ago someone suggested (either G4JNT or G3PLX) that there should no problem in working between these Loran sidebands and although I did not believe it at the time I now know that it is easy - I have been doing it for the last couple of weeks. The following is a description of how the band appears here when clear of evening QRN A frequency quoted as .703 means 137.703kHz. About 8 Loran lines close together .772 - .800 Clear band .769 - .771 Clear band .761 - .763 2 strong Loran lines and noise .755 - .758 Big carrier at .745 with upper sideband noise to .754. (about S6 - 7 in fast CW terms) Lots of weaker Loran sidebands .709 - .742 Clear band .695-.703 Clear band .681 - 690 Clear band .667 - .675 Frequency bands not quoted have Loran sidebands. The problem with the Loran is that many of the sidebands are pulsed so that they look like slow CW signals although I have got to know them now. I worked Peter, DJ8WL OO this evening (1645UT). On peaks his signal was strong enough to be audible using a narrow filter, other times he was down in the noise. Rain static closed in at the end of the QSO. I copied Dave's PSK31 tests which made some pretty pictures on Gram. I measured the centre frequency as .653 with sidebands extending to .671 and .637. Additional single frequency sidebands occured at .702 and .608. (I have saved the WAV files if you want them Dave) -- Regards, Peter, G3LDO