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.
Regards,
Javier
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