[time-nuts] Holdover recovery

[Hal Murray]

Has anybody studied what happens when a GPSDO comes out of holdover?  Has 
anybody seen any specs?  I don't think I have.

I think you have a choice of quick recovery for time or frequency, but you 
can't get both.

Suppose your setup has been in holdover for a while.  The frequency is 
slightly off.  The time offset of the PPS pulse will be the integral of the 
frequency offset.

What happens when you come out of holdover?  If you fix the frequency, the 
PPS will stay off.

Suppose the PPS has drifted by 1 ns.  If you correct that in 1 second, the 
frequency will need to be off by 1E9 during that second.


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