Return-Path: Received: (qmail 11303 invoked from network); 29 Aug 2003 15:29:41 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 29 Aug 2003 15:29:41 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 5164 invoked from network); 29 Aug 2003 15:29:24 -0000 X-Priority: 3 X-MSMail-Priority: Normal X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 29 Aug 2003 15:27:12 -0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 19sl7g-0007lT-Hu for rsgb_lf_group-outgoing@blacksheep.org; Fri, 29 Aug 2003 16:25:12 +0100 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.14) id 19sl7c-0007lK-I2 for rsgb_lf_group@blacksheep.org; Fri, 29 Aug 2003 16:25:08 +0100 X-Fake-Domain: gemini Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 19sl7X-0000P2-00 for rsgb_lf_group@blacksheep.org; Fri, 29 Aug 2003 16:25:03 +0100 X-No-DNS-For: 147.197.232.252 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 19sl7W-00012q-00 for rsgb_lf_group@blacksheep.org; Fri, 29 Aug 2003 16:25:02 +0100 Message-ID: <5.1.0.14.0.20030829155231.02af4b10@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Fri, 29 Aug 2003 16:24:55 +0100 To: rsgb_lf_group@blacksheep.org From: "James Moritz" MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: LF: GPS-locked PSK tests Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=0.0 required=5.0tests=noneversion=2.55 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) 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: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 1 Dear LF Group, As part of some experiments with GPS-locked PSK modulation for LF, I hope to run some TX tests tonight. I plan to transmit on 137.5000 kHz, running high power from about 2000utc - 2100utc, and reducing power to about 10W (about 5mW ERP) after that for a few hours. The modulation will consist of a sequence of 12 bits, with a bit period of 10 seconds, repeating every 2 minutes. The start of the sequence will be synchronized with the utc hour, so a new sequence will begin at the start of each even minute. Both the carrier frequency and phase keying are derived via a GPS time/frequency receiver, so should be very accurate. Received aurally or using spectrogram-type software (I would suggest settings as for QRSS3), the signal will just be a carrier with "clicks" occurring at the phase transitions. Any reports will be very welcome. Cheers, Jim Moritz 73 de M0BMU