On 2/29/20 2:47 PM, Attila Kinali wrote:
On Sat, 29 Feb 2020 17:01:27 -0500
Bob kb8tq <[email protected]> wrote:
Isn't that where "whispering gallery" modes come into the picture ?
…… and done with sapphire.
This is the real answer to “why is nobody going to do this?”. You already
have something ( the sapphire resonators ) that does better than
anything you could reasonably expect.
It's the other way round. Yes, we have *a* solution for better phase noise
and stability, but not *the* solution. A CSO is a full size 19" rack
filled with equipment that needs constant maintenance. Nothing you can
put on a satellite, much less carry around. People wouldn't even put it
in cellphone base station, although they would love to have the additional
frequency stability and phase noise performance to squeeze in some
more customers into the limited frequency space.
How does a CSO compare with a Mercury Ion clock - the latter does fit in
a satellite and is intended to replace the USO kind of function.
It is actually very hard to beat crystal oscillators and vapor cell
frequency standards in the stability/phase noise/size/power consumption/cost
trade-off. And until recently, quartz oscillators and vapor phase
standards occupied seperate areas in this trade-off space. Until the
CSAC came around and connected them.
Attila Kinali
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