[time-nuts] FE5680 temperature question

EWKehren at aol.com EWKehren at aol.com
Sat Jan 21 07:11:14 EST 2012


considering how important temperature is to the frequency accuracy I would  
only consider fan cooling. For less than $ 10 you can have a system that 
will  hold the temperature at 43 C. The fan is very quit. To get best 
performance I  would cover all sides except the bottom plate with foam. I have run 
tests and  with the fan running all the time at 25 C ambient the unit is held 
at 38 C  figuring 5 C margin for change in ambient is plenty. After testing 
many fan  solutions and evaluating performance I now use item 180780456923 
for any thing  that has to cool up to 13 W reliably. It is a copper heat 
sink/fan and all you  need is a 1/16 aluminum plate, a top cover with the fan 
cut out to make sure the  air moves over the fins (for testing I even used 
tape!) and a fan controller,  all this can be done for less than $ 10.
In my case it is more complex because I am installing it in a small case  
along with a Morion OCXO but the same fan is on the back. L shaped aluminum  
plates are on top and bottom bringing the heat out to the back, something I 
have  already used successfully with a FRS
Bert Kehren
 
 
In a message dated 1/20/2012 10:34:54 P.M. Eastern Standard Time,  
paulswedb at gmail.com writes:

I added  a heat sink to the FE5680.
Curious what temperatures have been measured  after an hour warm up.
Before heat sink 120 F top and bottom.

With  heat sink on the bottom quite a large one.
Top of case free air 105  F
Bottom 105 F
Internal, (screw out of the end and touching the internal  heat sink)
111-113F.
Whats a good temperature to be shooting  for?
Thanks

Regards
Paul
WB8TSL
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