[time-nuts] FE5680 temperature question
EWKehren at aol.com
EWKehren at aol.com
Sat Jan 21 12:11:14 UTC 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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