X-GM-THRID: 1203545094598401676 X-Gmail-Labels: rsgb lf X-Gmail-Received: 947c384295da847cb8d8f636d507396616b025e6 Delivered-To: daveyxm@gmail.com Received: by 10.54.72.5 with SMTP id u5cs37903wra; Tue, 16 May 2006 07:34:06 -0700 (PDT) Received: by 10.48.220.3 with SMTP id s3mr3214657nfg; Tue, 16 May 2006 07:34:05 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id a23si977772nfc.2006.05.16.07.34.04; Tue, 16 May 2006 07:34:05 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Fg0aV-0001du-On for rs_out_1@blacksheep.org; Tue, 16 May 2006 15:31:51 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Fg0aV-0001dl-56 for rsgb_lf_group@blacksheep.org; Tue, 16 May 2006 15:31:51 +0100 Received: from smtp803.mail.ukl.yahoo.com ([217.12.12.140]) by relay2.thorcom.net with smtp (Exim 4.51) id 1Fg273-00066y-14 for rsgb_lf_group@blacksheep.org; Tue, 16 May 2006 17:09:37 +0100 Received: (qmail 20664 invoked from network); 16 May 2006 14:30:40 -0000 Received: from unknown (HELO lark) (alan.melia@btinternet.com@81.131.102.85 with login) by smtp803.mail.ukl.yahoo.com with SMTP; 16 May 2006 14:30:39 -0000 Message-ID: <002201c678f5$4d8dd820$55668351@lark> From: "Alan Melia" To: References: <003e01c678db$dc5cad70$0200a8c0@AUG2004> Date: Tue, 16 May 2006 15:03:19 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Spam-Score: -1.0 (-) X-Spam-Report: autolearn=disabled,AWL=-1.039 Subject: LF: Re: Rb standard Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: 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 Status: O X-Status: X-Keywords: X-UID: 5265 Hi Walter I looked at one of those on eBay but bearing in mind your previous warnings about some Rb lamps..... it went beyond my (mean) bid. It looks like another case of "ten year life lamps" ?? Cheers de Alan G3NYK ----- Original Message ----- From: Walter Blanchard To: Sent: 16 May 2006 12:28 Subject: LF: Rb standard A number of TAIT T801 frequency standards have just appeared on the UK surplus market. They're ex-cellphone bases and I understand have been ditched in favour of GPS-locked standards. Consist of an Rb standard driving a couple of 12.6 MHz synthesizers that can be digitally offset by a few Hz. The interesting bit is the Rb standard which is a Frequency Electronics Inc. model 5660A. Its output is 10 MHz and on switch-on it ramps up and down over a few kHz searching for Rb lock. You can see it on a frequency counter. If it's working then after about 3-4 mins it stops quite suddenly and the "Lock" light comes on, if not it goes on searching forever and the lock light stays off. Unfortunately the ramping is a built-in software function and (unless somebody knows better) can't be switched off so if no lock not useful as an ordinary 10 MHz. osc. When locked, can be set precisely on frequency with a small trimmer. Anybody know anything about these units? FEI website not very helpful. Have checked four and three were dead. The good one had a 2000 datestamp, the others 1996-1998 so might be a clue there. I sent an email to FEI asking how long they were good for but no answer. Walter G3JKV.