[time-nuts] 10MHz Rubidium reference source for frequency counter

Brooke Clarke brooke at pacific.net
Mon Oct 27 16:26:40 EDT 2014

Hi Charles:

The SRS PRS-10 is based on their 10 MHz SC-10 oscillator.  This is what I installed in the Gibbs rack box and made use 
of it's the power supplies and added down counters to get a 1 PPS output.

There are options for phase noise and aging and I suspect these same options could be used when ordering the PRS-10.
Maybe Tom has data on some of the SC-10 oscillators?
Mail_Attachment --
Have Fun,

Brooke Clarke
Charles Steinmetz wrote:
> Karen wrote:
>> > Really I am looking for a source with a good short range stability performance between 1 and 10 seconds.
> I concur with everything Tom wrote.  If that is your goal, the best you are likely to do is with a good, free-running 
> (non-disciplined) OCXO.  That will have the best stability you can get (short of a hydrogen maser) from 0.1 seconds to 
> ~100 seconds.
> For the convenience of having automatic drift correction, many of us use GPSDOs and turn off the disciplining before 
> making measurements.
> I might consider a PRS10 as an alternative, but certainly no other "compact" Rb, disciplined or otherwise.  Even the 
> rack-mount HP 5065 can't beat a good free-running OCXO.  Many of the "compact" Rb units (and especially the FE5680) 
> have nasty output waveforms with many spurs.
> Best regards,
> Charles
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