[time-nuts] Disciplining Rubidium

[Tom Duckworth]

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

> > More precisely, if I had two black boxes, one containing
> > a GPS-Rb-XTAL setup and another containing GPS-XTAL,
> > what measurement would you make from outside the boxes
> > to distinguish from one another?
>
> Ah, clever question. Here's ten ways to distinguish them...
>


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