[time-nuts] Next step up from basic GPS/PPS timekeeping

[Hal Murray]

> From what others on the list have said before, WWVB offers performance
> that's at least a couple orders of magnitude worse than GPS, even if you
> correct for all of the expected diurnal variations in LF propagation. Given
> that a fairly pedestrian GPS module offers a nominal PPS accuracy of ~10ns
> for $25... 

Yes.  But it would be fun to measure the diurnal variations.

I thought WWVB was actually good at that.  It's ground wave rather than 
bouncing off the ionosphere.  But I'd like to measure both WWVB and WWV.

Has anybody built a WWV(B)DSO?  You would need a stable oscillator so you 
could average over days or weeks rather than hours.  I'm thinking of a 
surplus rubidium.  Maybe a manual screwdriver adjustment would be good enough 
and a PIC/AVR to make a PPS and fake GPRMC.



-- 
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