[email protected] said: > This got me to wondering - how do other GPSDO units work? Do they take days > and weeks to build up enough data to discipline themselves or are there > faster methods?
Hours to weeks is a reasonable ballpark. You want to look at the ADEV graph. At short Tau, the measurement error dominates. At long Tau, the drift of the O in the GPSDO dominates. What's short? What's long? That depends on the O and the environment. How stable is your temperature? Do you turn the heat down at night? That probably adds a significant 24 hour term. Does your air-conditioning cycle on/off every hour or so? ... How stable is your O? Junk crystal? Selected unit in a double oven? Rubidium? ... If you had good data, you would probably adjust the time-constant of your GPSDO to be at the bottom of the ADEV graph. (which may be broad rather than a sharp point) -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
