[time-nuts] FE-.5680A trimming resolution

[Hal Murray]

magnus at rubidium.dyndns.org said:
> Not quite right. If you lock up the clock, you do not lock to the birds,
> but to GPS time or UTC as received over GPS. The observed time of the  birds
> would be a bad solution since you can't see a particular bird  continously
> unless you is in geosync orbit. 

It's even more complicated than that.

Suppose you decide to lock onto a bird that you can see.  You have to correct 
for Doppler so you can't use a simple PLL.


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