You are measuring your counter stability, not the GPSDO stability. A locked GPSDO is way better than any free running counter if driven by its internal timebase oscillator.
On Thu, Oct 18, 2012 at 8:39 AM, Rob S. <robe...@dcsi.net.au> wrote: > Hello Group, first time post > > I have just got my Odetics 365 working again after it being packed away for > a few years. I have it connected to a HP 5386A frequency counter and am > monitoring the 10 MHz output ( down to 0.01 Hz res ). > > I am noticing the frequency is drifting about 1.5 to 2 Hz over the day and > settling low for a few hours ( aprox midday ) and then settling high about > 12 hours later. The 365 is showing TFOM4 and Time locked, has a GDOP of > 3.68 > and displays a frequency error of +2.98E-013 and a Std error of Est of > 4.80E-008. The averaging is turned off and it "see's" 3 to 5 satellites > continuously. My question is would this be normal behavior ( + or - 2 Hz ) > for this type of equipment or is it looking like I have something that is > drifting a bit ? Also would switching the averaging on help ? > > Any thoughts would be appreciated Group, > > Thanks and Cheers, > > Rob. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.