Return-Path: Received: (qmail 28851 invoked from network); 10 Feb 2004 15:37:07 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 10 Feb 2004 15:37:07 -0000 Received: (qmail 59058 invoked from network); 10 Feb 2004 15:38:15 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 10 Feb 2004 15:38:11 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1AqZxj-000Eq3-6J for dave@picks.force9.co.uk; Tue, 10 Feb 2004 15:38:11 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AqZwi-0008Fq-1p for rs_out@blacksheep.org; Tue, 10 Feb 2004 15:37:08 +0000 Received: from [205.188.144.208] (helo=imo-d22.mx.aol.com) by post.thorcom.com with esmtp (Exim 4.14) id 1AqZwc-0008Fh-OK for rsgb_lf_group@blacksheep.org; Tue, 10 Feb 2004 15:37:02 +0000 X-Fake-Domain: G0MRF@aol.com Received: from G0MRF@aol.com by imo-d22.mx.aol.com (mail_out_v36_r4.12.) id l.19e.200be7b5 (25914) for ; Tue, 10 Feb 2004 10:36:28 -0500 (EST) From: G0MRF@aol.com Message-ID: <19e.200be7b5.2d5a547c@aol.com> Date: Tue, 10 Feb 2004 10:36:28 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 8.0 for Windows sub 670 Subject: Re: LF: Timing GPS Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_MESSAGE,HTML_TAG_BALANCE_HTML,NO_REAL_NAME 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 Content-transfer-encoding: 8bit In a message dated 2/10/04 12:35:33 PM GMT Standard Time, ACTALBOT@mail.dstl.gov.uk writes:

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




Andy / group.

Would be happy to try this if there is a way of using the NEMA output from my e-trex venture. No problem with a little home constructing, but would prefer not to spend £86.

73

David