[time-nuts] yet another GPSDO design, or so
hmurray at megapathdsl.net
Sun Jun 27 19:02:51 UTC 2010
> "Interestingly, it is desirable to have the frequency of U7 drift slightly
> rather than being synchronized with the VCXO. A slight random drift averages
> out the count ambiguity that is inherent in any pulse-counting device. My
> measurements indicate that the simple phase-measuring circuit I use is
> consistently accurate to 2 or 3 ns (for a 30-second measurement), while
> without drift, the resolution would be limited to 42 ns. The $5 crystal
> oscillator module drifts adequately"
Don't forget hanging bridges.
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