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

[Bob kb8tq]

Hi

> On Mar 26, 2018, at 2:18 AM, Attila Kinali <attila at kinali.ch> wrote:
> 
> 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.

Weill on the same basis I could say that the laser driven Rb’s I’ve evaluated have
not been all that great for stability. ….. Last time I checked, the best Rb’s out there
are flying in GPS satellites. There *are* papers on them. 

Bob

> 
> 			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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