[time-nuts] Ventilation of HP 58503A GPS time & frequency reference receiver

HP-mini blm-ubunet at slingshot.co.nz
Sat Dec 13 14:08:07 EST 2014

On Sat, 2014-12-13 at 15:18 +0000, Dr. David Kirkby (Kirkby Microwave
Ltd) wrote:

> I just noticed. Since there are no feet on this, there is no way any
> air can get into the slots in the base!!!! The oven was running too
> hot for me to touch - I doubt that is normal, but perhaps others no
> different.
> Dave

Pull the rear rubberized plastic bump stop off the case & fit it up the
other way.

As long as the OCXO operates below its turning point it has thermal
control. Only need to dissipate the non-heating power, that sets the max
operating temperature.
Some OCXOs are quieter running in high temperature ambient still air.
All are degraded by changes in thermal load.

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