[time-nuts] Rubidium Performance

Javier Herrero jherrero at hvsistemas.es
Sun Feb 5 22:22:08 UTC 2012

El 05/02/2012 22:27, John Miles escribió:
>> John
>> Thank you for your effort. It would be nice if you could confirm the 4 to
> 5
>>   Hz dither that seems to be the loop time constant and long term aging
> that
>> will  influence the GPS/Rb control loop time constant setting. I did see 1
>> E-12 per  month which may be unique to that unit.
>> Bert Kehren
> There's a lot of impulse-like structure in the 10 MHz signal from the units
> I have, certainly.   You can see the spikes here that are associated with
> the spurs at multiples of 1 Hz in the earlier PN plot, as well as some even
> stronger pulses that show up about every 28 seconds.  They might correspond
> to the grand repetition rate of the DDS.
The DDS self-update is around 28.4s, so for sure these spikes are 
related... and seems quite strong.




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