Return-Path: Received: (qmail 29132 invoked from network); 19 Mar 2004 17:40:06 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 19 Mar 2004 17:40:06 -0000 Received: (qmail 40529 invoked from network); 19 Mar 2004 17:47:50 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 19 Mar 2004 17:47:49 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1B4O61-000AQK-Jd for dave@picks.force9.co.uk; Fri, 19 Mar 2004 17:47:49 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1B4O5Q-0001Bh-88 for rs_out_1@blacksheep.org; Fri, 19 Mar 2004 17:47:12 +0000 Received: from [213.232.95.59] (helo=relay.salmark.net) by post.thorcom.com with esmtp (Exim 4.14) id 1B4O5P-0001BY-Q3 for rsgb_lf_group@blacksheep.org; Fri, 19 Mar 2004 17:47:11 +0000 Received: from mailhost-av.pncl.co.uk ([195.224.180.233] helo=olympus.pncl.co.uk) by relay.salmark.net with esmtp (Exim 4.24) id 1B4W0I-0004Yp-SL for rsgb_lf_group@blacksheep.org; Sat, 20 Mar 2004 02:14:26 +0000 X-Fake-Domain: k7t Received: from k7t ([212.158.248.200]) (authenticated bits=0) by olympus.pncl.co.uk (8.12.10/8.12.10) with ESMTP id i2JHlQJh007306 for ; Fri, 19 Mar 2004 17:47:26 GMT X-Bad-Message-ID: no DNS (k7t) Message-ID: <000b01c40dda$7731cac0$2201a8c0@k7t> From: "Walter Blanchard" To: rsgb_lf_group@blacksheep.org Date: Fri, 19 Mar 2004 17:48:58 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Pinnacle-MailScanner-Information: Please contact the ISP for more information X-Pinnacle-MailScanner: Found to be clean X-MailScanner-From: blanch@pncl.co.uk X-Spam-Score: 0.0 (/) Subject: LF: 240GHz Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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: 2 Looking at the screen grabs I must agree that they have achieved absolutely astonishing frequency stability; as they say, 1 in 10-13. Even more so for being the result of only a 5 MHz OCXO, ultra-stable or not, mixing with a Gunn osc, which as John says can easily drift 1 GHz/sec at that freq. Throw away your caesiums and forget locking to GPS, the day of the really low-cost ultra-stable standard is with us. Looks like all those tens of millions of dollars being spent on hydrogen masers to get only 1 in 10-14 is being wasted. Let's hope we'll hear more about how they did it. Walter G3JKV. --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.631 / Virus Database: 404 - Release Date: 17/03/04