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

Scott McGrath scmcgrath at gmail.com
Sun Dec 14 13:57:27 EST 2014

From pictures bumpers are installed in an inverted position.  Reverse them

Whoever put this together in CN did not have any idea of how this series of cases are assembled or did not care

Content by Scott
Typos by Siri

> On Dec 13, 2014, at 2:08 PM, HP-mini <blm-ubunet at slingshot.co.nz> wrote:
> 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.
> Brett.
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