[time-nuts] Disciplining Rubidium

John Miles jmiles at pop.net
Thu Apr 24 00:09:30 EDT 2008


No idea, really.  It may not even be a universal principle but it sure seems
that way.

Something in the Datum 9390 I have also degrades the noise quite a bit,
relative to what comes out of the FRS-C Rb module.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Hal Murray
> Sent: Wednesday, April 23, 2008 8:52 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Disciplining Rubidium
>
>
>
> > 11) Short-term phase noise; the GPS-Rb sources don't seem to be as
> > clean as the better GPS-OCXO packages.
>
> Is there something fundamental that causes that, or is it just an
> engineering
> quirk?
>
> One guess would be that they don't use as good/expensive a
> crystal in the Rb
> setup because they don't need it for holdover.
>
>




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