[time-nuts] Disciplining Rubidium

John Miles jmiles at pop.net
Thu Apr 24 00:26:30 EDT 2008


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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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




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