[time-nuts] Rack-mounting an LPRO?

[Roy Phillips]

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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