Return-Path: Received: (qmail 5455 invoked from network); 18 Nov 2003 18:33:48 -0000 Received: from unknown (HELO netmail00.services.quay.plus.net) (212.159.14.218) by mailstore with SMTP; 18 Nov 2003 18:33:48 -0000 Received: (qmail 18218 invoked from network); 18 Nov 2003 18:33:48 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from post.thorcom.com (193.82.116.20) by netmail00.services.quay.plus.net with SMTP; 18 Nov 2003 18:33:37 -0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AMAaz-0002xQ-Cm for rsgb_lf_group-outgoing@blacksheep.org; Tue, 18 Nov 2003 18:29:01 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.14) id 1AMAat-0002xG-F9 for rsgb_lf_group@blacksheep.org; Tue, 18 Nov 2003 18:29:00 +0000 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 1AMAZZ-00007f-00 for rsgb_lf_group@blacksheep.org; Tue, 18 Nov 2003 18:27:33 +0000 X-No-DNS-For: 147.197.232.252 Received: from [147.197.232.252] (helo=rsch15) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 1AMAZX-00076R-00 for rsgb_lf_group@blacksheep.org; Tue, 18 Nov 2003 18:27:31 +0000 From: "James Moritz" To: rsgb_lf_group@blacksheep.org Date: Tue, 18 Nov 2003 18:27:32 -0000 Organization: University of Hertfordshire X-Bad-Message-ID: no DNS (rsch15) Message-ID: <000001c3ae01$a1cf3ee0$fce8c593@rsch15> MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-reply-to: <002001c3adec$96036d80$6e1999c2@k7t> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-UH-MailScanner: No Virus detected Subject: LF: RE: Freq wobble Content-Type: text/plain; charset=us-ascii; 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-Status: No, hits=0.0 required=5.0 tests=none 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: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 2 -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Walter Blanchard Sent: 18 November 2003 15:56 To: rsgb_lf_group@blacksheep.org Subject: LF: Freq wobble >I've seen similar wobbles in GPS-disciplined standards. The fundamental >gradually drifts off then the GPS software algorithm slowly pulls them back >in again. How often and how far depends on the programming.... Dear Walter, LF Group, It's a bit of a big wobble - 0.5Hz at 137kHz amounts to about 4 parts per million, so I definitely wouldn't recommend that particular model of frequency standard if that is the case! I could not see any sign of it here in Brookmans Park. Perhaps it could be an intermod between a stable and an unstable signal at higher frequencies - or perhaps it could be a low-level birdie inside the RX from the digital stuff there - do G3LDO and G3YXM use the same rig? Cheers, Jim Moritz 73 de M0BMU --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.525 / Virus Database: 322 - Release Date: 09/10/03