[time-nuts] Rb cooling
EWKehren at aol.com
EWKehren at aol.com
Mon Jul 18 01:36:45 UTC 2011
Charles sounds like what I am doing. What size fan do you use?
Bert
In a message dated 7/17/2011 9:13:42 P.M. Eastern Daylight Time,
charles_steinmetz at lavabit.com writes:
Poul-Henning wrote:
>Cooling Rb's should happen only through the base-plate.
>For frequency stability, you should strive to have a constant
>baseplate temperature.
I mounted an FRS-C in an unvented cast aluminum box by its baseplate
(after cleaning up the mating surface in the box on a mill to get
good contact), then mounted the cast box on shock mounts in an
enclosure along with a power supply, batteries, dist amp, dividers,
monitoring, etc. The outer box has a small, variable-speed fan that
is controlled by the temperature of the inner box in the middle of
the FRS-C baseplate contact area. The control loop keeps that
temperature at 45C +/- about 0.1C. It seems to work very nicely. I
can't detect any effect from the fan's vibration.
Best regards,
Charles
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