[Premium-Rx] Frequency Standards

[GandalfG8 at aol.com]

Hi John
Thanks for the information.
I used to use an ovened crystal standard with distribution amp, built inhouse 
by Siemens in the UK,  but there was always the niggling doubt as to how well 
calibrated it actually was.
When the Z3801A GPS units became available that seemed like the ideal answer, 
and probably still is, but I just couldn't resist the rubidium unit.
I've realised that it's as easy to get hooked on nice test gear as it is on 
radios:-)
This particular Racal standard is quoted as having an accuracy of plus or 
minus 5 parts in 10 to the minus 11 per month, or 5 in 10 to the minus 10 per 
year, and I doubt that it's even two years old yet.
Other than having a desire for things being spot on, or as good as possible 
anyway, I think it will take quite a while before that degree of drift is going 
to matter much for me.
What is the recommended calibration interval for something like this?
regards
Nigel

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