Brian, > You may also want to search for HP An1279, it also goes over HP > smartclock operation, and look for a paper titled "the Global > Positioning System and HP SmartClock" by John A. Kusters.
In the meantime I have not only found these but also "Smart Clock: A New Time" by David Allan et al which shows that "Smart Clock" is originally a NIST invention & patent and explains very well how it works. Perhaps what I and You have seen is a direct consequence of applying the Smart Clock algorithm. Best regards Ulrich > -----Ursprungliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Brian Kirby > Gesendet: Donnerstag, 18. Juni 2009 01:51 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Z3805 initial behaviour after power up > > > They do not talk about driving the frequency off, but they > warn to keep > the receiver locked the first 24 hours, so it can determine how the > oscillator ages. Its in the section on "holdover" (page 52 > of the PDF , > page 3-8 of the user guide). > > You may also want to search for HP An1279, it also goes over HP > smartclock operation, and look for a paper titled "the Global > Positioning System and HP SmartClock" by John A. Kusters. > > If you have a broadband connection, I can email you each one, if that > will help. > > Brian > > Ulrich Bangert wrote: > > Brian, > > > > thanks for your information! > > > > > >> algorithm. From what I read about the smart clock, it takes > >> 5 days for it to complete its initial learning cycle and then its > >> > > continuously > > > >> refining. > >> > > > > Is that from the Z3801 manual, which I have available, or > do you have > > any other in depth information source? > > > > Best regards > > Ulrich > > > > > >> -----Ursprungliche Nachricht----- > >> Von: time-nuts-boun...@febo.com > >> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Brian Kirby > >> Gesendet: Mittwoch, 17. Juni 2009 16:58 > >> An: Discussion of precise time and frequency measurement > >> Betreff: Re: [time-nuts] Z3805 initial behaviour after power up > >> > >> > >> Ulrich, > >> > >> I have two Z3801A and both of them act close to what you > >> describe in the > >> first 24 hours of power up. I believe its part of the > disciplining > >> algorithm. From what I read about the smart clock, it takes > >> 5 days for > >> it to complete its initial learning cycle and then its > continuously > >> refining. > >> > >> Brian > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.