Hal, as long as you maintain long-term phase lock it's a disciplined oscillator. So, yes, a carrier tracking WWVB receiver with sufficiently stable flywheel LO is a WWVBDO.
Said, too-short or too-long 100 ns cycles is one thing. Still ok for many applications. But tell me more about extra or missing pulses in the ublox-7. That sounds like a show stopper to me. /tvb (i5s) > On Aug 19, 2014, at 2:05 PM, Hal Murray <[email protected]> wrote: > > > [email protected] said: >> its not a GPSDO though, not even a simple one :) >> It does not discipline an oscillator. It generates the output by >> mathematically calculating how many phases it has to add/drop in a second, >> then digitally adds/drops/extends/retards the phase of the output clock to >> achieve an average of number of desired clock cycles. > > Is there something about the term GPSDO that says I have to do the "D" in the > analog domain rather than the digital domain? > > I agree that current technology doesn't give results that are useful for many > applications that currently use GPSDOs. What if the clock ran at a GHz? 10 > GHz? Sure, it would have spurs, but would it be useful for some applications? > > Is a GPSDO still a GPSDO if the D/A driving the VCXO only has a few bits? > How many bits does it need to be a real GPSDO? > > Is a battery powered wall clock listening to WWVB at 2 AM a WWVDO? It's got > a pretty good ADEV if you go out far enough. > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > 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. _______________________________________________ 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.
