On 6/10/22 12:13 PM, Richard (Rick) Karlquist wrote:
I think there is a severe misunderstanding of this issue.
First of all, "rapid warmup" is a red herring. The real
issue is "rapid frequency stabilization".
Indeed. But to a certain extent, that's why oscillators don't have 5
second warm up times - it wouldn't help. So the "few minutes" is a good
compromise between design simplicity and waiting for the internals to
equilibrate.
I suspect that those fancy USOs in vacuum bottles take a long, long time
to come to equilibrium.
And that is one of the claims to fame of the CSAC - from power on to "on
frequency" is quite short.
The time it takes for the oven to cut back (typically only
a minute or two) is a very minor part of the time budget
to get to frequency stabilization. You could have an AT
cut oscillator that reached "oven warmup" in 1 second, but
then you would have something like a 1 hour wait to get
frequency stability, due to the thermal stresses.
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