[time-nuts] GPS 1 PPS accuracy limits

[jimlux]

life speed wrote:
> Time Nuts;
> 
> I have a customer request for a microwave frequency synthesizer with
> extreme accuracy requirements; 4 X 10^-11, or 0.04 PPB.  Obviously
> this is way out of quartz oscillator territory.  Is GPS 1
> pulse-per-second useable, or do they need an atomic clock?  Maybe
> they don't realize what they are spec'ing.
> 
> 

Do they have other requirements (Allan deviation? phase noise?)

Over what time span do they want 4E-11 accuracy? 1 second, 1000 seconds, 
days?

A synthesizer locked to a Stanford Research PRS10 (datasheet accuracy 
5E-11) is in that ballpark.