For reference, Ridge Equipment has a photo of one of this year's crop of
FE-5680A mounted to a large aluminum plate.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330233071735
http://i43.tinypic.com/126cpcp.jpg
Leigh/WA5ZNU
Almost all rubidium standards DO specify the use of some form of a heat sink. For
the FRK and M100 units this can be a heat sink with around 1" fins or just
bolted to a metal plate or chassis.
The military freq standard that had M100's in them had the unit mounted to a 5x5x.2" aluminum plate that was in turn bolted to the chassis. My Efratom PTB-100 time bases for the Tektronix TM500 mainframes have a large heat sink mounted to a FRK style oscillator.
LPROs are supposed to be mounted to a metal chassis (they usually come with a
thermal pad attached to them). I have seen them lose lock in free air. I saw
one mounted in a piece of cell phone equipment. It was bolted to a large heat
sink that formed most of the front of the enclosure.
I have also seen FE-5680A's in their native habitat (again, cell phone equipment). They
were mounted to a thick (1/8"?) PCB around 6x16". The side of the PCB that the
5680 was bolted to had a solid ground plane. The 5650A's had one side bolted to a metal
chassis.
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