In talking to Charles Wenzel some years back, he mentioned what he called the "quartz-to-crud" ratio. i.e.: How much contamination you get while making a quartz crystal vs. the Q of the quartz blank itself.
It seems that through either luck/design or just demands of the industry that 5MHz is the sweet spot for lowest close-in phase noise of an XO. Other technologies may very well change that in future, but for best close-in noise a 5MHz XO seems to be the best today. -Brian, WA1ZMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of John Ackermann N8UR Sent: Thursday, April 24, 2008 7:21 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Disciplining Rubidium John Miles wrote: > 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 I'm not sure about that -- at least, the Wenzel ULNs show better noise at small offsets for the 5 MHz than the 10 MHz versions (though the floor is the same). _______________________________________________ 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.