[time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit

Hal Murray hmurray at megapathdsl.net
Thu Dec 14 01:29:45 UTC 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.

-- 
These are my opinions, not necessarily my employer's.  I hate spam.







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