[time-nuts] Z3805 initial behaviour after power up
Ulrich Bangert
df6jb at ulrich-bangert.de
Thu Jun 18 06:28:38 UTC 2009
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-bounces at febo.com
> [mailto:time-nuts-bounces at 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-bounces at febo.com
> >> [mailto:time-nuts-bounces at 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
> >>
> >> _______________________________________________
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> >
> >
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