[time-nuts] Rubidium Performance
jherrero at hvsistemas.es
Sun Feb 5 22:22:08 UTC 2012
El 05/02/2012 22:27, John Miles escribió:
>> Thank you for your effort. It would be nice if you could confirm the 4 to
>> Hz dither that seems to be the loop time constant and long term aging
>> 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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