"Richard B. Gilbert" <[EMAIL PROTECTED]> writes: >David J Taylor wrote: >> Unruh wrote: >> [] >>> With a minpoll of 4, just setting the phase correctly with zero drift >>> compensation would at worst be out by 1ms by the next reading. And >>> you can get a pretty good estimate of the drift, even if it is >>> changing. The temp coefficient is not 10PPM/degree C. More like 1 or >>> less. That means the first few measurements gives a pretty good >>> estimate of the drift ( ie to a few PPM) and then the finer >>> corrections can come while things settle down. >> >> It isn't NTP which is the limit, but the GPS receiver acquiring lock from >> scratch after an indeterminate period of being switched off. The GPS >> could take minutes to lock and declare that it has valid time. >> >> David >> >>
>And ntpd could take many minutes to bludgeon the local clock into >submission! It's easy to determine and set the correct time. It's less >easy to determine and set the correct frequency and thus KEEP the >correct time. Actually it is relatively easy to determine the frequency as well in a short time. and then refine it. It is NOT easy if you use a Markovian strategy like ntp uses. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
