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LF: Rb standard

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Subject: LF: Rb standard
From: "Walter Blanchard" <[email protected]>
Date: Tue, 16 May 2006 12:28:25 +0100
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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.
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