I am not sure the floor would be the same. I expect it would be about 6 dB lower from what I remember. This is mostly due to the Q of the resonator itself. As I recall, about 25 years ago when I was really concerned about close in phase noise due to the low data rates concerned and the multiplication up to 44 GHz, when we went from a 5 MHz to a 10 MHz oscillator the manufacturers wanted a 6 dB relief in the specification. Also it seems to me in the early 70's, to the best of my recollection, oscillators at around 3 MHz gave the best carrier to noise ratio on a per hertz basis. - Mike
Mike B. Feher EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 908-902-3831 - cell -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Ackermann N8UR Sent: Thursday, April 24, 2008 8:21 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 -- [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.
