[time-nuts] Exact Rubidium frequency

[Hal Murray]

> I have also seen the frequency of a Hydrogen Maser given as both
> 1,420,405,751 Hz and ...752 Hz.  I would be very surprised if the
> frequency was an exact whole number of Hertz different from Caesium,
> so perhaps this is just rounded for convenience as again it can be
> steered to anywhere you like? 

If Hydrogen and Rubidium clocks can be tweaked slightly, I assume Cesium can 
be too.

How do people who build Cesium clocks know what the "right" value is?


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