On 6/12/2015 8:27 AM, Channel Jumper wrote:
Irv Finkleman VE6BP;840688 Wrote:
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
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.
Not necessarily. For instance, many tube type rigs blow air directly on
the finals to keep them cool, with vents over the finals to let the hot
air out. Much more efficient than trying to draw air through the case.
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.
It depends on where the heat is generated and how the fan is designed to
handle the heat. Both methods are used.
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!
I would find someone with the same radio and ask them which way the air
is blowing.
But then this once again shows you have no inkling about ham radios. Go
back to your CB pals.
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