Return-Path: Received: (qmail 9369 invoked from network); 9 Mar 2004 16:09:03 -0000 Received: from unknown (HELO ptb-mxscan03.plus.net) (212.159.14.237) by ptb-mailstore04.plus.net with SMTP; 9 Mar 2004 16:09:03 -0000 Received: (qmail 81768 invoked from network); 9 Mar 2004 16:09:03 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore03.plus.net (212.159.14.217) by ptb-mxscan03.plus.net with SMTP; 9 Mar 2004 16:09:00 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1B0jmu-000L1s-Ii for dave@picks.force9.co.uk; Tue, 09 Mar 2004 16:09:00 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1B0jmB-00057P-6R for rs_out_1@blacksheep.org; Tue, 09 Mar 2004 16:08:15 +0000 Received: from [134.58.240.41] (helo=nibbel.kulnet.kuleuven.ac.be) by post.thorcom.com with esmtp (Exim 4.14) id 1B0jmA-00056h-EG for rsgb_lf_group@blacksheep.org; Tue, 09 Mar 2004 16:08:14 +0000 Received: from localhost (localhost [127.0.0.1]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 3C4224C15E for ; Tue, 9 Mar 2004 17:07:44 +0100 (CET) Received: from octavianus.kulnet.kuleuven.ac.be (octavianus.kulnet.kuleuven.ac.be [134.58.240.71]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id BDE024C168 for ; Tue, 9 Mar 2004 17:07:43 +0100 (CET) X-Fake-Domain: dell-rik.fys.kuleuven.ac.be Received: from dell-rik.fys.kuleuven.ac.be (pc-10-33-165-177.fys.kuleuven.ac.be [10.33.165.177]) by octavianus.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 9A4B4AF08E for ; Tue, 9 Mar 2004 17:07:43 +0100 (CET) Message-Id: <5.1.0.14.0.20040309165805.00b869d0@u0019445.kuleuven.be> X-Sender: u0019445@u0019445.kuleuven.be X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 09 Mar 2004 17:11:40 +0100 To: rsgb_lf_group@blacksheep.org From: Rik Strobbe In-Reply-To: <404DE2F7.5070601@usa.net> References: <000c01c405d7$9a522a00$2e2965d5@oemcomputer> <7D653C9C42F5D411A27C00508BF8803D01A9F48C@mail.dstl.gov.uk> <000c01c405d7$9a522a00$2e2965d5@oemcomputer> Mime-Version: 1.0 X-Virus-Scanned: by KULeuven Antivirus Cluster Subject: Re: LF: RE: Ionospheric doppler ? Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 Content-transfer-encoding: 8bit Alberto, When I remember it right most "DCF-77 IC's" can be forced to receive mode (pulling a pin to ground or so). 73, Rik ON7YD At 16:29 9/03/2004 +0100, you wrote: >Thanks all for your comments. > >The clock has an analog part, the receiver, with a very small ferrite >antenna, and a large black wax blob on the PCB, with many traces >reaching it. Usually this is the low cost "packaging" of an IC, which >probably is a sort of simplified microcontroller. > >But it turned out that Andy and Johan were right. I did what I should >have done since the beginning, and what I usually do when building >an oscillator to test its stability : the "blow test". > >I blowed for 20 seconds on the exposed components of the clock, >and the result was a change of more than one microsecond.... >so the 1pps signal is not derived directly from each pulse of DCF-77, >but from the internal oscillator, corrected every now and then with >the received signal... > >I think I can use it as a high sensitivity thermometer, to measure >fractional degree changes in the temperature of my shack :-) > >73 Alberto I2PHD > > >