[time-nuts] What does determine the short term stability of an Rb vapor cell standard?

[ew]

In the PRS 10 The OCXO is controlled by a DAC not directly by the optical package. With Corby's work on the Super where he also used in one case a good and an other case  not so good 10811 it is the S/N  at the detector output in a 0.05 sec loop that makes the difference. Results where the same.
Bert Kehren
 
In a message dated 3/26/2018 2:23:16 AM Eastern Standard Time, attila at kinali.ch writes:

 
 On Sun, 25 Mar 2018 15:28:10 -0400
Bob kb8tq <kb8tq at n1k.org> wrote:

> Well, magnetic shielding, temperature coupling between cells, photo detector
> noise floor, phase noise of the various signals, basic stability of the “ocxo” and 
> I’m sure a few other issues as well……

The effects of those seem not to be that big. If you look at the
phase noise plot of the measurements that John Miles did [1],
it looks like the PRS10 comes very close to the 5065 for everything
shorter than 1s. Which suggests, that they might have missed something
in the control loop or set its constant too long.

 Attila Kinali


[1] http://www.ke5fx.com/rb.htm

-- 
<JaberWorky> The bad part of Zurich is where the degenerates
 throw DARK chocolate at you.
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