Hi Once it’s sync’d with GPS, a normal MCU clock should be able to drive it for a few days if you had some sort of initial calibration process.
Bob > On Sep 25, 2015, at 9:15 AM, John Ackermann N8UR <[email protected]> wrote: > > I may be remembering incorrectly, but I thought that you only need the GPS > for initial sync; after that shouldn't the processor be able to maintain the > sequence without new GPS input, so long as the timer clock doesn't drift too > badly? From a known starting point, the modulation pattern should be > predictable into the future. > > John > ---- > > On 9/24/2015 5:11 PM, Charles Steinmetz wrote: >> Paul wrote: >> >>> Here is the detailed document on the wwvb d-psk-r. >> >> Interesting solution, and a good study in persistence. >> Congratulations! But I thought the main point of having a working WWVB >> receiver was as a backup if GPS fails (or for use in circumstances where >> WWVB reception is possible but not GPS reception). If GPS is working, >> and you have a GPS rx/GPSDO, what is the point of having a time and/or >> frequency source that relies on GPS but only has the precision of WWVB? >> And what good is the predictive de-psk-r when GPS is not working? >> >> [Yes, I get that if one runs a museum it's nice to have working exhibits >> even if they are simulated, and it's no big deal if the exhibits don't >> work from time to time. But the curator's solution doesn't seem to >> solve the time-nuts' real problem.] >> >> I hasten to add that I don't really care one way or the other about GPS >> alternatives, particularly alternatives with the relative imprecision of >> WWVB over time scales shorter than geological. Personally, I presume >> that if there is ever a persistent, system-wide GPS failure it will be >> due to a natural or man-made catastrophe of earthshaking proportions >> (literally) and there will be many, more urgent concerns than time-nuts' >> experiments. But others have expressed concern over having just one >> time and frequency standard available. For them, isn't a fully >> independent solution that does not rely on GPS required? >> >> Again, congratulations on bringing this idea to fruition. >> >> Best regards, >> >> Charles >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.
