PULL THE AIR OUT>>
One my twins, I can lay my hand on top right over either the PA cage or
the audio output/transformer area, and I cannot tell they are on. I
also cannot hear the fans running...Nothing fancy just modern 80mm QUIET
fans.
The R4B fan is installed behind the gap between the Bandpass box and
transformer.
See this:
http://picasaweb.google.com/captcurt08/DrakeFanInstall#
FWIW
KU8L
Curt
ph...@aol.com wrote:
I found two articles on adding a fan to a T-4X. The first one
uses only a diode & capacitor and uses the size of the capacitor to
control the amplitude of the half-wave rectified DC voltage. The fan
is configured to draw air OUT of the PA enclosure.
http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/TransmitterFan.htm
The second article uses a dropping resistor to control the fan
speed, and the fan is configured to blow air INTO the PA enclosure.
http://www.k5dkz.com/t4xfan.html
Circuit differences aside, any thoughts on blowing air in as
opposed to sucking it out? (Yes, I know the former may get the PA
cage dirtier faster).
Paul, K4MSG
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