For SSB voice operation and CW operation I leave the fan speed at
NORMAL. For digital modes, which all have a higher duty cycle, I
usually set the fan speed to 1. I do find the fan speed increments up
and down as needed and as driven by the temperature. When running 400
to 500 watts most of the time for digital modes, I occasionally see 60
degrees. The fan speed at 1 does not elevate the room noise at all.
In fact, I don't hear it, although I do have sound damping material on
the wall immediately behind the equipment. Usually something in the
house or shack is making more noise.
As to if setting the fan speed to 1 for digital modes, it seems to keep
the amp temperatures overall a bit lower. No scientific study conducted.
73
Bob, K4TAX
On 10/1/2019 11:51 AM, Andy Durbin wrote:
Thanks to everyone who contributed their experience of operating with min fan
speed set above 0.
I have some ideas for a test series and I'll share anything I learn from it.
Here is a teaser for those interested in KPA500 thermal management. Did you
know that, for a KPA500 that has not transmitted for a long time, the Z bracket
is hotter than the heat sink and the heat sink is hotter than the finals. For
that condition the heat flow is from the Z bracket, into the heat sink, and
then it heats the finals. The heat flow reversed during TX as the finals heat
up.
73,
Andy, k3wyc
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