[time-nuts] Next step up from basic GPS/PPS timekeeping
Hal Murray
hmurray at megapathdsl.net
Wed Feb 24 22:22:03 UTC 2016
> 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.
--
These are my opinions. I hate spam.
More information about the Time-nuts_lists.febo.com
mailing list