Return-Path: Received: (qmail 27750 invoked from network); 9 Jan 2002 12:49:34 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by exhibition.plus.net with SMTP; 9 Jan 2002 12:49:34 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 1752 invoked from network); 9 Jan 2002 12:49:24 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 9 Jan 2002 12:49:24 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16OI7d-0002Hj-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 09 Jan 2002 12:46:25 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16OI7c-0002He-00 for rsgb_lf_group@blacksheep.org; Wed, 09 Jan 2002 12:46:24 +0000 Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id MAA27738; Wed, 9 Jan 2002 12:55:09 GMT Received: (qmail 1909 invoked from network); 9 Jan 2002 13:34:46 -0000 Received: from gauntlet.mail.dstl.gov.uk (192.168.9.10) by baton.dstl.gov.uk with SMTP; 9 Jan 2002 13:34:46 -0000 Received: by gauntlet.mail.dstl.gov.uk; id NAA20048; Wed, 9 Jan 2002 13:04:49 GMT Received: from unknown(172.17.128.171) by gauntlet.mail.dstl.gov.uk via smap (3.2) id xma020044; Wed, 9 Jan 02 13:04:40 GMT Received: from FRN-MAIL-R3.dstl.gov.uk (unverified) by mailguard.dstl.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Wed, 9 Jan 2002 12:51:41 +0000 Received: by frn-mail-r3.dstl.gov.uk with Internet Mail Service (5.5.2650.21) id ; Wed, 9 Jan 2002 12:45:26 -0000 Message-ID: <7D653C9C42F5D411A27C00508BF8803DCB9942@pdw-mail-r1.dstl.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: RE: GPS Coherent PSK Transmission Date: Wed, 9 Jan 2002 12:45:19 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Interesting that there appears to be no sign of the callsign ident..... This was sent every 15.1 minutes approx (the .1 was the callsign itself) 24 WPM as on-off keying, completely independent of the PSK data - so is almost guaranteed to be in there somewhere. Timing of the ID CW signal was derived from a ceramic resonator so is only within a percent of the right speed. The sidebands of the high bandwidth keying will occur at multiples of the keying rate, ie 10 Hz sidebands here with a few at 3.3 Hz due to the dashes. Whatever, Jim's reception was in too narrow a bandwidth to be influenced by this so he saw only the spreading caused by the phase transitions. There ought to be a slight reduction in strength during the keying ID sequence, but the central trace is too saturated to make this out. Andy G4JNT -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.