On 09/10/2010 11:50 PM, jimlux wrote:
Ralph Smith wrote:
OK, stop me if this is really stupid. The initial site is in Colorado.
Would it be possible to use WWV? In particular:
1) Lock a reference to the carrier of one of the WWV signals
2) Generate PPS off of WWV-locked reference
3) Periodically send difference of GPSDO PPS and WWV-locked PPS home,
along with GPS lock indication
4) When GPS goes away do the math at home and correct for the timing
drift
of the GPSDO compared to WWV-locked reference
I don't think a received WWV (or WWVB) signal is stable to 30ns...
The critical aspect here is stable to 30 ns _relative_. I.e. common mode
changes mostly cancels.
I think it is problematic... the frequency of the carrier is too low.
The vector sum of reflections may shift the group delay, and in this
case the time error of such sums can be expected to be proportional to
the wavelength. I would use one wavelength as the rule of thumb as long
as it is not better quantified, and I would assume that individual
changes can range that full range...
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
