[time-nuts] Rack-mounting an LPRO?

Bob Camp lists at rtty.us
Sun Feb 28 01:30:41 UTC 2010


Hi

Another option for cooling the LPRO would be a fan in combination with a heat sink.. That's not my favorite way to go, but it should take care of the cooling.

Bob


On Feb 27, 2010, at 6:51 PM, Bruce Griffiths wrote:

> For operation at ambient temperatures up to 50C the manual states that a baseplate heatsink with a thermal resistance of 2C/W or lower is required.
> 
> Bruce
> 
> paul swed wrote:
>> I agree that thats not really an effective heat sink.
>> 
>> On Sat, Feb 27, 2010 at 6:12 PM, Bob Camp<lists at rtty.us>  wrote:
>> 
>>   
>>> Hi
>>> 
>>> 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.
>>> 
>>> Bob
>>> 
>>> 
>>> 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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