[time-nuts] Rack-mounting an LPRO?

[Bob Camp]

Hi

Typical rule of thumb for a 1U is that under 10 watts - no problem at all / no issues. 10 to 20 watts - things get warm. Above 20 watts - you can't get away without a fan somewhere. In some cases that's a fan in the wall of the rack, but it's still a fan. 

Bob

 
On Mar 2, 2010, at 7:31 AM, Roy Phillips wrote:

> Paul
> I have a professionally manufactured Rb Frequency Standard which is a 19 inch 1U rack mounted unit.  It contains the Datum Rb. unit and a 24 volt, 2 amp. linear PSU, plus two small interface PCB's. only. This is currently free standing (not in a rack).  After a while the 1U cabinet runs quite warm. Could be worth bearing in mind.
> Roy
> 
> --------------------------------------------------
> From: "Paul Boven" <p.boven at xs4all.nl>
> Sent: Monday, March 01, 2010 11:09 PM
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Subject: Re: [time-nuts] Rack-mounting an LPRO?
> 
>> Hi everyone,
>> 
>> First of all, thank you all very much for the many reactions to my query. I'd like to clarify a few things (my original posting was a bit too terse, I guess).
>> 
>> The LPRO-101 is 1.5" high, 3.7" deep and 5.0" wide. Its height makes it ideal to fit inside a 1U rack unit while laying on its baseplate, and the manual states it was designed to fit in 1U or 3U VME units. And I happen to have a 1U 19" rack enclosure that fits it very nicely, snug between the top and bottom cover. "LPRO" stands for 'Low Profile Rubidium Oscillator".
>> 
>> But from many of your reactions, it seems that this proposed setup would lead to problems getting rid of the heat generated by the LPRO, and the enclosure's baseplate would not be sufficient for cooling. I particularly liked the heat-pipe solution that was suggested, but there would be not enough height in the 1U enclosure for such a system. There seem to exist heatpipes of only 500um thickness these days, but I have no idea where one could find one of those.
>> 
>> Scott Mace replied that he has a 1U high Datum Rubidium unit, probably something like their Datum-8040 product, and it works fine for him.
>> 
>> As I already have the LPRO, rack-unit and PSU, I will attempt to get this combination to work, but will clearly have to put much more effort into (passively) cooling things than anticipated. Thanks again for the input, and I'll let you know how things turn out in a few weeks.
>> 
>> Regards, Paul Boven - 73 de PEaNUT
>> 
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> 
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