See: http://www.leapsecond.com/pages/tbolt-8d/
As you can see, the phase stays within 5 or 10 ns during the day. The frequency stays within 5e-11 with 10 second averaging times; 5e-12 with 1000 second averaging times. Send me your raw data (off-list) and I'll have a look at it. How sure are you that the 2.5e-11 variation is the GPSDO and not the "precision oscillator", or your comparator? /tvb ----- Original Message ----- From: "Bill Dailey" <[email protected]> To: "Time Nuts" <[email protected]> Sent: Tuesday, July 31, 2012 5:27 PM Subject: [time-nuts] GPSDO diurnal variation > Does anyone have plots of true frequency variation of their 10 MHz standards > over days? I am trying to see if what I am seeing is typical or if I need to > get a better antenna/gpsdo tuning/temp control. Right now I am on vacation > so am capturing data under much warmer than normal temps (ac turned down) and > am seeing 250 uHz deviation with a period of about 24 hours (2.5x10-11). I > am trying to look at this in a way that is more intuitive and concrete to me > than Allan deviation. I am using a precision oscillator as the comparator > and am removing linear drift (stochastic) in excel. It seems surprisingly > high. > > Doc > KX0O _______________________________________________ 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.
