Phase noise generally gets better with the higher-frequency OCXOs, though. I think the best of all possible worlds would be a 5-MHz OCXO like the one you describe, being used to discipline a 10 MHz or higher-frequency part.
-- john, KE5FX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Tom Duckworth > Sent: Wednesday, April 23, 2008 9:24 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] Disciplining Rubidium > > > John, > > I think the best of all worlds would be a double-ovenized SC-cut OCXO > running at 5 MHz (lower mass). These OCXOs have the lowest phase noise and > best Allen variance short term stability (1-100 seconds) of any > xtal or Rb. > Then have this OCXO disciplined by the GPS, with an ephemeris of > variations > constantly collected, statically averaged over a long period (at least 1 > month), and the calculated average used to adjust the OCXO frequency. > > Tom > Tom Duckworth > 510-886-1396 > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of John Miles > Sent: Wednesday, April 23, 2008 8:02 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Disciplining Rubidium > > Adding to Tom's worthy list: > > 11) Short-term phase noise; the GPS-Rb sources don't seem to be > as clean as > the better GPS-OCXO packages. > > -- john, KE5FX _______________________________________________ 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.
