There will always be disagreement on this but I vote for blow when
external forced cooling. The air can be directed exactly to where it is
needed, not sucked from all over the place.
I ran my K2 overnight for days at 50W doing some Grey-line propagation
tests. Small external fan tilted at 45 degrees and blowing down onto
the heat sink in the area where the transistors were bolted. The little
screamer on the back of the KPA100 never activated.
The situation with the K3 is different, the PA heat sink is buried in
the box and the heat has to be sucked out otherwise all you would have
is a fan oven.
Regards,
Mike VP8NO
On 21/07/2014 20:37, Fred C. Jensen wrote:
When I was using my K2/100 on RTTY, I stuck a muffin fan over the hottest part
of the heatsink with a little square of sticky back velcro. Could run 100
watts just fine. Fan blew down.
73,
Fred K6DGW
TDY Huntington Beach CA
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