Hi Kirby, Didier, I agree, the short term performance (typically <200s or so) is almost entirely determined by the OCXO performance itself. That particular Miller OCXO is exceptionally good in terms of short term stability, I am surprised that the OCXO can perform so well <1000s free-running. For longer hold-over periods one would need to electronically compensate for Aging-drift, temperature compensation, and other drifts to establish good ADEV for intervalls >5000s or so, and this does not seem to be done on the Miller and Thunderbolt units. Of course the Z3801A is the Grand-Daddy OCXO of them all. The Z3801A does seem to have some short term noise issue compared to the others, maybe it's due to the Sigma-Delta modulation on its DAC? It seems that the measurement below 0.2s intervalls is limited by the measurement equipment since all (except Z3801A) units seem to have identical performance <0.2s intervalls? bye, Said In a message dated 2/12/2008 16:57:28 Pacific Standard Time, [EMAIL PROTECTED] writes:
Its interesting that the Miller/Jupiter design appears to outperform everything except the Z3801, in the GPS locked modes. Maybe the KISS principle at work. [EMAIL PROTECTED] wrote: > Hello Tom, > > excellent web-page! That looks like a lot of work was done. > > Would you have data for 24 hour hold-over performance (86400s ADEV) for > these units? > > thanks, > bye, > Said > > > In a message dated 2/11/2008 21:17:49 Pacific Standard Time, > [EMAIL PROTECTED] writes: > > Sifting through old data, in addition to recent measurements > made in the past few months, I have 4 very interesting plots > of GPSDO performance. > > The goal was to see real-life plots of disciplining in action by > contrasting free (unlocked) vs. GPS-locked performance as > compared with my 10 MHz house reference. The four GPSDO > measured so far are: Z3801A, Fury, Thunderbolt, and Miller. > > http://www.leapsecond.com/pages/gpsdo/ > > Comments & questions welcome. > > I hope to measure quite a few more this year. Contact me > offline if you want your favorite one included in the list. Note > that I'm not necessarily looking for the best GPSDO; instead, > for this page at least, the more variety the better. > > /tvb > > > _______________________________________________ > 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. > > > > > > **************The year's hottest artists on the red carpet at the Grammy > Awards. Go to AOL Music. > (http://music.aol.com/grammys?NCID=aolcmp00300000002565) > _______________________________________________ > 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. **************The year's hottest artists on the red carpet at the Grammy Awards. Go to AOL Music. (http://music.aol.com/grammys?NCID=aolcmp00300000002565) _______________________________________________ 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.
