[time-nuts] Beginner's Atomic Clock

[Dr. David Kirkby]

On Tue, 17 Sep 2019 at 04:00, Dana Whitlow <k8yumdoober at gmail.com> wrote:

> The nice thing about a Rb is that its short term stability (seconds to
> minutes and perhaps
> even longer) is much better than that of a GPS timing receiver.  The bad
> news is that Rb
> standards exhibit long term frequency drift in the neighborhood of a few
> parts in 10^11
> per month.  A pretty fair compromise is to use an Rb standard that is
> disciplined by GPS
> PPS pulses with a loop time constant on the order of a day or so.
>
> Dana   (K8YUM)


Is  there any advantage in using a GPS Rb disciplined oscillator vs a GPS
disciplined high quality OCXO like the HP 10811A? I can’t understand why
there should be, as a Rb source would use an OCCO in its output stage
Therefore in each case

* Short term stability depends upon the quality of the OCXO
* Long term stability depends upon GPS.

Perhaps there’s is period over which the the overall stability can be
improved by adding a rubidium oscillator. I would be interested to know if
that is the case or not.

Dave

> --
Dr. David Kirkby,
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