Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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This comes up every once in a while....
The fan on the TR-7 should always be mounted to blow air OUT. A piece
of electronic equipment that is DESIGNED to be fan cooled has a cooling
_SYSTEM_. The TR-7 system is designed for the air to be pulled in
through the slots in the top and bottom of the cabinet and blown OUT via
the fan. Reversing this flow does not cool the entire transceiver as
effectively. As for the PTO temperature, the absolute temperature is
not particularly important, rather the change in temperature as the
heatsink heats and cools with transmissions. Blowing air IN forces the
heated air from the heatsink past the PTO area, causing the PTO
temperature to fluctuate. The dial lamp that some cite as a source of
PTO drift is actually a constant heat source that helps to stabilize the
PTO area at a slightly higher temp. There IS a "warmup" time for the
TR-7 for this temperature to stabilize.
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://www.k4oah.com>
Floyd Sense wrote:
"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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I have a set of temperature probes and will take some readings near
the PTO with the fan blowing in and out to see what happens to the
temperature. Hard to believe that mounting the fan to blow in, rather
than out, would result in less PTO temperature rise.
73, Floyd - K8AC
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