X-GM-THRID: 1203533621080903190 X-Gmail-Labels: rsgb lf X-Gmail-Received: 2e0ef3cbe53be0e0fcfb01c271d9f6605fb06271 Delivered-To: daveyxm@gmail.com Received: by 10.54.72.5 with SMTP id u5cs31052wra; Tue, 16 May 2006 04:31:43 -0700 (PDT) Received: by 10.48.161.3 with SMTP id j3mr3037193nfe; Tue, 16 May 2006 04:31:43 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id k24si809471nfc.2006.05.16.04.31.42; Tue, 16 May 2006 04:31:43 -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 1Ffxjd-0000lK-L7 for rs_out_1@blacksheep.org; Tue, 16 May 2006 12:29:05 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ffxjd-0000lB-7o for rsgb_lf_group@blacksheep.org; Tue, 16 May 2006 12:29:05 +0100 Received: from olympus.pncl.co.uk ([195.224.180.233] helo=olive.pncl.co.uk) by relay1.thorcom.net with esmtp (Exim 4.51) id 1Ffzg9-00038O-R4 for rsgb_lf_group@blacksheep.org; Tue, 16 May 2006 14:33:53 +0100 Received: from AUG2004 (cpc3-leat1-0-0-cust70.hers.cable.ntl.com [86.3.124.71]) (authenticated bits=0) by olive.pncl.co.uk (8.13.4/8.13.4) with ESMTP id k4GBTGsw008051 for ; Tue, 16 May 2006 12:29:17 +0100 Message-ID: <003e01c678db$dc5cad70$0200a8c0@AUG2004> From: "Walter Blanchard" To: Date: Tue, 16 May 2006 12:28:25 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2670 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 X-Pinnacle-MailScanner-Information: Please contact the ISP for more information X-Pinnacle-MailScanner: Found to be clean X-Pinnacle-MailScanner-SpamScore: sss X-MailScanner-From: blanch@pncl.co.uk X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,AWL=-0.048,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: Rb standard Content-Type: multipart/alternative; boundary="----=_NextPart_000_003B_01C678E4.3A972B60" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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: 5354 This is a multi-part message in MIME format. ------=_NextPart_000_003B_01C678E4.3A972B60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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.=20 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=20 software function and (unless somebody knows better) can't be switched = off so if no lock not=20 useful as an ordinary 10 MHz. osc. When locked, can be set precisely on = frequency with a small trimmer.=20 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=20 for but no answer. Walter G3JKV. ------=_NextPart_000_003B_01C678E4.3A972B60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
A number of TAIT T801 frequency=20 standards have just appeared on the UK surplus market.
They're ex-cellphone bases and I = understand have=20 been ditched in favour of GPS-locked standards.=20
Consist of an Rb standard driving a = couple of 12.6=20 MHz synthesizers that can be digitally offset by a few=20 Hz.
The interesting bit is the Rb = standard which=20 is a Frequency Electronics Inc. = model=20 5660A.
Its output is 10 MHz = and on=20 switch-on it ramps up and down over a few kHz searching for Rb = lock.=20 You can see it on
a frequency counter. If it's working = then after=20 about 3-4 mins it stops quite suddenly and the "Lock" light
comes on, if not it goes on searching = forever and=20 the lock light stays off. Unfortunately the=20 ramping is a built-in 
software function and (unless = somebody knows=20 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=20 trimmer. 
Anybody know anything about=20 these units? FEI website = not very=20 helpful.
Have checked four and three were = dead.  The=20 good one had a 2000 datestamp, the
others 1996-1998 so might be a = clue there.=20 I sent an email to FEI asking how = long they were=20 good
for but no answer.
 
Walter G3JKV.
 
  
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