[Elecraft] Cooling fans

[Mike Harris]

G'day,

| sink fins.  Suck the hot air away from the heat sink, that way it works 
in
| tandem with the internal fan rather than fighting the internal fan
| airstream.

The air stream from the internal fan flows into the K2 under the KPA100 
heatsink and emerges from the front.  That way it keeps much of the heat 
out of the box.

I have used a 3 inch fan sitting on the heatsink near the front propped up 
at 45 degrees and blowing to onto the area where the PA's are fitted 
underneath.  When I was doing some long run (12 hour) QRSS tests at 40W 
output the heatsink ran cool and the KPA fan didn't even come on.

Regards,

Mike VP8NO