That was my thought, too, especially since a fan mounted on the back of
the PA cage and blowing in would cool the two PA tubes unequally; e.g., one
of the tubes "blocks" the direct air from the fan from reaching the other.
And, I think unequal cooling of a 2-tube PA is a rather bad idea (from my
old broadcast transmitter maintenance days).
As I think about it, a fan directly above the PA tubes and sucking air
out out is probably the best for equal cooling of the tubes, but of course
there is a cosmetic issue with having a fan sitting on top (although IMHO
reliability beats cosmetics any day, but that's just me). There shouldn't
be a clearance issue since one should allow a couple of inches of clearance
above the T-4X for cooling even without an external fan.
Paul, K4MSG
In a message dated 10/25/2010 9:58:15 P.M. Eastern Daylight Time,
wb5...@martineer.net writes:
Suck the hot air out, Paul, don't force it into the PTO and other areas to
make drift even worse. The rig was designed for convection to take the
hot air out. It will run MUCH cooler pulling the hot air out and as you
said, not get so dirty inside.
73,
Don, WB5HAK
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