Fellow time-nuts,
While we often look at long-term stability, ADEV etc. we consider
oscillators in their free-running properties. This is all fine and dany,
but when we want to use an oscillator as a clean-up oscillator, the
servo-loop with surpress much of the low-frequency/high-tau properties
and replace that with that of the reference.
Consider for instance that we have a LPRO rubidium and we want to use a
clean-up oscillator to provide better phase-noise, what would be a good
selection?
While there is plenty of choices, it is a bit different from that which
is relevant when considering it as a free-running oscillator. The white
noise which dominated far-out would dominate, and only some of the
flicker phase becomes relevant.
I could easily get a OCXO of good quality, but really, what would be
interesting choices? Have someone measured this enough to get a kind of
rough idea at least?
Cheers,
Magnus
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