At 03:56 PM 2006/04/14 -0400, you wrote:
>Maybe I'm missing something here, but I've never subscribed to the theory of
>having fans run beyond PTT. What purpose does it serve? The transistors are
>generating heat only when they are "on." As soon as they are "off" they
>begin to cool down on their own. If the fans are doing their job, they are
>keeping temperatures to a prescribed level the entire duration of transmit.
>While running the fans beyond the end of transmit will cool the finals after
>the end of the QSO quicker than without, why should it matter?
FWIW our clients in the mid 1980s had scheduled visits from IBM to add some
circuitry to the IBM S/38 series of minicomputers to keep the fans running
for an extra five minutes after the computer was turned down. These were
computers slightly larger a standard chest freezer. Hard drives were in
a separate enclosure They were having problems with temperatures inside
the circuitry rising after the power and fans were turned off
Tony
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