[time-nuts] Rack-mounting an LPRO?

[Ed Palmer]

What else is going to be in the rack?  If your 1U enclosure is packed in 
tight between other devices there might be no cooling at all.  You might 
need a fan to move some air.

I don't know if you can find something like this, but I scavenged heat 
sinks from an old Compaq DL760 server that might fit your situation.  
Here's what the heat sink looks like.  The aluminum plate is about 1/4" 
(6.4 mm) thick.  Notice the heat pipes.



Here's what it looks like on the LPRO.  You'll have to drill holes in 
the plate to match the LPRO.



It's not perfect, but it certainly does the job - particularly if you 
had a fan blowing through the fins.  The total height is about 1.75" (45 
mm).

But remember, the more you cool the LPRO, the more power it will draw to 
keep itself warm so you don't want to overdo the cooling.

Ed

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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