[time-nuts] Some results of PRS10 and Trimble Resolution T

Tom Van Baak tvb at leapsecond.com
Thu Jun 29 15:32:58 EDT 2006

> Thanks for the link to your report, Tom.  I was wondering what this 2 sec
> "bump" in the ADEV was that everyone was talking about.
> The "bump" at 2 sec is just the loop tau of the main clock servo.  The
> physics package is performing at the (fairly typical) level of about
> 2e-11/sqrt(tau).   The OCXO is somewhat better than that.  From Tom's plot
> it looks like the OCXO is good to about 3-4e-12 on tau=0.1 to 1 second.
> Because they've set the loop tau to about 1 seconds, the performance of
> OCXO is degraded as it is steered to the atoms on that timescale.
> ...


Thanks for all your detailed comments. To support
your points, here's an LPRO rubidium for contrast.


True, there's no bump in the LPRO -- but when you
compare the LPRO vs. PRS10 plots you see that
the bump is evidence of a good thing for the PRS10.

If nothing else everyone should view this one plot
where 4 rubidiums are compared:



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