On 2021-08-08 05:57, Mike Harris via Elecraft wrote:
Hi Jerry,
Yes the little fan is a screamer.
[...] blowing down on it at
Hi Mike,
That makes all sorts of sense. Because the fan can blow much harder
on the heatsink than it can suck off of it. The power of sucking is
limited by the ambient air pressure, whereas the power of blowing is
unlimited.
I had a similar issue with my shallow irrigation water well. Needed
to clean it out with a water pump. The pump could not suck water out of
the well because the water was at 26 feet below grade, which is the
absolute max that any pump - no matter how fancy or expensive - could
suck upwards. Because the force pushing that water up was just ambient
air pressure. The fix was to use a submersible sewage pump and a
sandbag.
- Jerry KF6VB
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