[time-nuts] Rack-mounting an LPRO?

Bob Camp lists at rtty.us
Sat Feb 27 23:12:30 UTC 2010


1mm is pretty thin for a heat sink made of steel. You might consider an aluminum plate around 4 mm thick and the length and width of the case to act as a heat spreader. 

The LPRO probably already has the tape on the bottom of it. The tape may be in fine shape. If it's not, scrape off what remains and use a normal thermal grease (heat sink compound) between the bottom of the LPRO and the heat spreader. You also should fill the gap between the heat spreader and the steel case with something. I would use some sort of thermaly conductive epoxy. You don't need the silver loaded stuff. Ceramic loaded should be ok.


On Feb 27, 2010, at 5:30 PM, Paul Boven wrote:

> Dear time-nuts,
> I've just bought a used LPRO-101 which should get a permanent home inside an instrument rack. I've also found a very nice 1U high metal case, and a fitting 24V 1U power supply - leaving plenty of room for a distribution amp and a microcontroller to log things like lamp and Xtal voltage.
> The rackmount enclosure is 1U high, and seems to be made of 1mm thick galvanized steel. Would that make a good enough baseplate for the LPRO? Would I need to do anything to improve the thermal contact between the rubidium oscillator and the baseplate, and if so, any recommendations on what to use there? The LPRO "User's guide and integration guidelines" recommend 2degC/W thermal resistance (for up to 50degC ambient), and using some special thermal tape that will probably be very hard to get at these days. If any of you has already put something like this together, I'd be very interested in your suggestions.
> Regards, Paul Boven - PE1NUT
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