Paul -
Out the back is fine. You're NOT 'cooling the PA tubes' so much as just
getting the heated air out of and away from the cage. UP is perhaps
better, although unless you take the transmitter out of the cabinet
you're dealing with TWO perforated pieces of metal that do NOT align, so
any convection gain is probably lost due to turbulence.
Also you do NOT need a hurricane. A light (silent) breeze will
dramatically reduce the cage and transmitter temperature.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-B, C-Line&
TR-4/C Service Supplement CDs
<www.k4oah.com>
ph...@aol.com wrote:
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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