Dave Hart wrote: > After close to a week of calibration, I fudged then flipped off > noselect on my GPS+PPS refclock in the early minutes of the UTC day. > > It looks to me (from my limited perspective of no other local > refclocks) that I've gone from single-digit milliseconds to double- > digit microseconds accuracy. > > Looking at the last 800 loopstats lines for the refclock, representing > a bit more than 3 hours of 16s polls, the offsets in microseconds look > like > > -79.497 min > -26.961 mean > 20.565 max > 17.381 stddev > > The jitter (us) > > 1.907 min > 7.974 mean > 35.64 max > 4.651 stddev > > How does that look to more jaded PPS eyes?
Pretty bad actually: After a day or so you should see 0-5 us offset and jitter. > > The refclock is a Garmin GPS 18x LVC connected to a dual PII 400 via I have one of those! (A Dell?) It might work even better in single-cpu mode if it is a dedicated ntp server. Terje > serial with PPS wired to the carrier detect pin. > > Cheers, > Dave Hart -- - <Terje.Mathisen at tmsw.no> "almost all programming can be viewed as an exercise in caching" _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
