I am not sure. I am on vacation now. Will watch it as I get. Back to normal temperature and try some other tests to sort it out. Will send you some data later.
Sent from my iPad On Jul 31, 2012, at 5:39 PM, "Tom Van Baak" <[email protected]> wrote: > 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. _______________________________________________ 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.
