Return-Path: Received: (qmail 68097 invoked from network); 10 Feb 2004 12:33:10 -0000 Received: from unknown (HELO ptb-mxscan03.plus.net) (212.159.14.237) by ptb-mailstore03.plus.net with SMTP; 10 Feb 2004 12:33:10 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 6459 invoked from network); 10 Feb 2004 12:33:10 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 Received: from ptb-mxcore03.plus.net (212.159.14.217) by ptb-mxscan03.plus.net with SMTP; 10 Feb 2004 12:33:09 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1AqX4e-0001Il-FZ for dave@picks.force9.co.uk; Tue, 10 Feb 2004 12:33:08 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AqX2b-0002EL-Nb for rs_out@blacksheep.org; Tue, 10 Feb 2004 12:31:01 +0000 Received: from [192.5.29.49] (helo=relay.dstl.gov.uk) by post.thorcom.com with smtp (Exim 4.14) id 1AqX2a-0002EC-Hu for rsgb_lf_group@blacksheep.org; Tue, 10 Feb 2004 12:31:01 +0000 Received: (qmail 6151 invoked from network); 10 Feb 2004 12:30:57 +0000 X-Fake-Domain: unknown Received: from unknown (HELO warlock.dstl.gov.uk) (192.5.29.10) by relay.dera.gov.uk with SMTP; 10 Feb 2004 12:30:57 +0000 Message-ID: <7D653C9C42F5D411A27C00508BF8803D01A9F413@mail.dstl.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Date: Tue, 10 Feb 2004 12:30:55 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Subject: RE: LF: Timing GPS Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 Well, I was really thinking of GPS locked PSK rather than any incoherent mode. WIthout the need for clock and frame timing recovery we could scrape every possible advantage for coherent signalling. With such superb accuarcy of timing even without carrier recovery, it seems a pity to throw all the advantages away by using on-off keyed power detection. I did some basic tests last year with GPS locked 1 B/s PSK and with a very simple decoder managed to receive down to frighteningly low signal levels. Andy G4JNT -----Original Message----- From: Jean-Louis.RAULT@fr.thalesgroup.com [mailto:Jean-Louis.RAULT@fr.thalesgroup.com] Sent: 2004 February 10 12:12 To: rsgb_lf_group@blacksheep.org Subject: RE: LF: Timing GPS Are you talking about something like coherent CW, Andy ? 73 de Jean-Louis F6AGR > -----Message d'origine----- > De : Talbot Andrew [mailto:ACTALBOT@mail.dstl.gov.uk] > > Judging by the lack of replies to this thread - there seems > little interest > here. A very great pity, as accurate GPS locked timing is > the next great > improvement we could make to LF signalling. "This e-mail is intended for the recipient only. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely upon this e-mail. If an addressing or transmission error has misdirected this e-mail, please notify the author by replying to this e-mail." "Recipients should note that all e-mail traffic on MOD systems is subject to monitoring and auditing."