[time-nuts] Cold Rubidium over hyped?

[Bob kb8tq]

Hi

> On Nov 8, 2019, at 11:18 PM, cdelect at juno.com wrote:
> 
> The pressure sensitivity for a classic design can easily be eliminated.
> 
> I'm pretty sure that the old Varian R20 cell was mostly immune.
> 
> Either using the R20 design or stiffer convex ends in a modern design
> would work.
> 
> Also a sealed optical unit has been used to get rid of the pressure
> problem.

OCXO’s have a pressure sensitivity as well. There, the only real answer 
is a welded enclosure. Anything short of that simply integrates the pressure
via low leak rates and makes things even stranger …..

Bob

> 
> Any of these methods would be trivial in a new design.
> 
> The Rb/glass absorption is mostly in the lamp, when using the proper
> glasses in the cell and using similar lasers to what the cold standard
> uses eliminates that.
> 
> Newer RF architecture would also help, NLDL multiplier, low noise
> synthesis, etc.
> 
> My main gripe was that either they were either intentionally reducing the
> performance of their masers or using a setup that did not do justice to
> them.
> 
> Cheers,
> 
> Corby
> 
> 
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