[time-nuts] Best frequency to start for GHz synth ?

[Poul-Henning Kamp]

Somewhat related to the discussion about GPSDO's I have a basic question:

It used to be that 5MHz was the "hot spot" for crystals on the parameters we care about as time-nuts.

Have advances in X-tal science changed that ?

To make it a concrete question:

If tasked with designing a Cs/Rb beam/fountain/whatever today, would one still start the synthesizer-chain at 5 MHz or would a higher frequency give better results ?

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