Quote:
Originally Posted by Irv Finkleman VE6BP
I have been wondering which way the fans on my TS-930 should be
blowing. Should they take the ambient air from outside and blow
it on the heat sink, or should they be evacuating the inside air
in the vicinity of the heat sink and blowing it out? I have been
restoring the unit and both fans required replacement.
I've surfed a number of sites on the subject but can never get
a definitive answer.
Thanks in advance for any assistance...
de Irv, VE6BP
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If the fans are forcing the air in, it is forcing the hot air deeper inside of the heat sink, making it hotter, not colder - unless the air outside of the radio is colder than the air inside of the heat sink.
We tried push pull on a set of car stereo amplifiers in a box and found that if the fans drew the air away from the box, the amplifiers ran cooler than if we tried to push air into the box and then draw air back out of the box.
You need almost twice as much fan drawing the hot air out as what you use to push it in.
I would make sure that I used your radio in an open air space and not inside of a box or cabinet. Too many people tries to hide their ham radios, out of sight, out of mind, out of the old lady's sight and they don't think about what it does to the transceiver - since it both transmits and receives.
They confuse it with a plain old radio that just receives.
A radio that just receives shouldn't get very hot.
Then they wonder why it gets so hot when they transmit and do not have airflow around the radio.
Dumb!