[time-nuts] Connections for FE-5680A rubidium sources

Bob Camp kb8tq at n1k.org
Tue Dec 16 07:40:28 EST 2014


You are dumping about 15W into the heat sink (or cooling system). You would like to keep the baseplate at < 40C if possible. In a 25C room, that works out to a 1 C/W heat sink. If you are using a fan, that’s a pretty small gizmo. If you are building a metal case and putting other stuff in the box, the case wall might be good enough. The standard text book thermodynamic calculations apply if you want to go through all the math on this or that structure.


> On Dec 16, 2014, at 7:20 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> On 16 December 2014 at 12:16, Bob Camp <kb8tq at n1k.org> wrote:
>> Hi
>> One fairly important issue - the unit needs to be on a heat sink. If you run it without cooling of some sort, it will not run for very many years.
>> Bob
> I do realize that, but how big? Normally "the bigger the better" is
> not an unreasonable rule on heatsinks, but I have heard that cooling
> these too much is bad. I have here a heatsink about 600 x 300 x 150
> mm, although I think that is a bit OTT !!
> Dave
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