Return-Path: Received: (qmail 70428 invoked from network); 18 Feb 2004 14:04:44 -0000 Received: from unknown (HELO ptb-mxscan03.plus.net) (212.159.14.237) by ptb-mailstore04.plus.net with SMTP; 18 Feb 2004 14:04:44 -0000 Received: (qmail 76550 invoked from network); 18 Feb 2004 14:04:43 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 X-Priority: 3 X-MSMail-Priority: Normal Received: from ptb-mxcore03.plus.net (212.159.14.217) by ptb-mxscan03.plus.net with SMTP; 18 Feb 2004 14:04:41 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1AtSJd-000Jcd-Jm for dave@picks.force9.co.uk; Wed, 18 Feb 2004 14:04:41 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AtSID-0004Nj-Sl for rs_out@blacksheep.org; Wed, 18 Feb 2004 14:03:13 +0000 Received: from [194.25.134.83] (helo=mailout07.sul.t-online.com) by post.thorcom.com with esmtp (Exim 4.14) id 1AtSID-0004Na-A9 for rsgb_lf_group@blacksheep.org; Wed, 18 Feb 2004 14:03:13 +0000 X-Fake-Domain: fwd01.aul.t-online.de Received: from fwd01.aul.t-online.de by mailout07.sul.t-online.com with smtp id 1AtSIC-00032L-01; Wed, 18 Feb 2004 15:03:12 +0100 X-Fake-Domain: (r3b800ZfZeSpbI88lJ6d-mBrKm-lLjDgUMFp3ziIilZ6aDOGd4dc8y@[62.224.50.114]) Received: from (r3b800ZfZeSpbI88lJ6d-mBrKm-lLjDgUMFp3ziIilZ6aDOGd4dc8y@[62.224.50.114]) by fwd01.sul.t-online.com with smtp id 1AtSHt-0jd19s0; Wed, 18 Feb 2004 15:02:53 +0100 From: "jannsen" <0482183881-0001@t-online.de> To: rsgb_lf_group@blacksheep.org References: <7D653C9C42F5D411A27C00508BF8803D01A9F415@mail.dstl.gov.uk> <4031FB0A.8040706@usa.net> X-Mailer: T-Online eMail 2.34 MIME-Version: 1.0 Date: Wed, 18 Feb 2004 15:02:53 +0100 Message-ID: <1AtSHt-0jd19s0@fwd01.sul.t-online.com> X-Seen: false X-ID: r3b800ZfZeSpbI88lJ6d-mBrKm-lLjDgUMFp3ziIilZ6aDOGd4dc8y Subject: Re: LF: Re:: Timing GPS Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.4 required=5.0 tests=FROM_ENDS_IN_NUMS,FROM_STARTS_WITH_NUMS 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 Alberto di Bene schrieb: > Hello group, > > Andy G4JNT has written some notes about his GPSDO (GPS DIsciplined > Oscillator) project. > I have been quite happy to host them on my Web site. You can find them > here : > http://gpsdo.i2phd.com > > 73 Alberto I2PHD > > Hi Alberto, hi Andy, tks for the effort. Andy writes in the PDF: "........ Initially I was sceptical thinking it probably only consisted of 10000 pulses per second - which could have been no better than the 1 PPS signal itself in the short term. ......." some astronomical observatories use the GPS rcvr GSU-25. It´s 10kHz output is obviously pulsed according to the following specification: Reception: 12channel parallel Reception Frequency: 1575.42MHz ± 1MHz (C/A code) Measurement accuracy: 1Sec ± 300nS (typ) Supply power Voltage: +5V ± 5%, ripples under 50mV Current consumption: Under 200mA Operation Temperature range: -300C~+700C In/Output Communication mode: Serial transfer with start/stop Time Mark Pulse output: 1PPS/10KHz regards Uwe/dj8wx