[time-nuts] Rack-mounting an LPRO?

[Ed Palmer]

Sorry, the pictures got lost.  Let's try again.

Ed Palmer wrote:
> 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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