[time-nuts] Racal 9475 Rubidium

Dan Rae danrae at verizon.net
Tue May 1 11:20:31 EDT 2018

On 5/1/2018 2:18 AM, Paul Bicknell wrote:
> As I have just bought a Racal 9475 Rubidium and it has problems
> Is there any stock faults ?
> What is the life of the rubidium standard?
The Racal manual for this only covers the support stuff.  Your problem 
is almost certainly with the Rb module; these were some variety of FRK, 
either FRK-L or -H.  These are repairable without much difficulty, but 
obviously you will need the manual for it.  In the FRK there is a 
crystal that will have aged, and a free running audio oscillator around 
8 kHz in the servo unit that may well need attention.  I did fix mine 
some ten or more years ago and since then it has worked when needed.   I 
wouldn't worry about the lamp yet before checking the rest of it.


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