[time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Hal Murray
hmurray at megapathdsl.net
Wed Dec 13 20:29:45 EST 2006
> the one thing that troubles me is the use of a 24 MHz oscillator to
> count the width of the 1PPS signal. This yields a precision of
> 4.16e-8
> Question: Why not multiply the VCXO or OCXO output by 5 or 10 and run
> that into 24 or 32 bit counter? OR just sample the counter on every
> 10th PPS?
What's the time constant on the filter? Isn't it already long enough to
average out that sort of problem? I think that's effectively running the
counter for the filter time constant.
--
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