Tobias asked, @Jim Harman Indeed I know Lars' GPSDO. Can you tell what performance you achieved with one of those?
It is hard for me to quantify the performance because I don't have anything better to compare it to. The TIC resolution is 1 nsec. I can say that it will stay phase locked to the 1 pps from my GPS for months at a time and if I set the time constant to 1,000 sec, the 300 sec average error detected by its TIC is within +/- 5 nsec more than 50% of the time. The maximum error is about 100 nsec. If I compare the variations in the TIC error from one day to the next, I can easily see variations of about +/- 20 nsec on a period of just less than 24 hours caused by the shifting geometry of the satellites overhead. I am sure this could be improved significantly if I used a a timing-type GPS instead of the Adafruit one I have. Lars may have better data in his write-up, > -- > --Jim Harman _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
