"It also seems like this fan logic could be built into the KPA1500 firmware if the result is a quieter and cooler amp. on receive."
Actually it seems as though Elecraft chose to go the other way - delay the fan speed increase until a higher temperature. See KPA1500 firmware release notes:
"New fan speed temperature thresholds:
- Change the temperature points at which the RF Deck fans are switched in. This does not change the Power Supply's fan speeds.
- Prior settings: 60, 65, 70, 75, 80 degrees.
- New settings: 60, 70, 78, 85, 90 degrees."
I'm taking an interest in this as I'm gathering data on KPA500 dissipation, temperatures, and fan speeds for my station.
73,
Andy k3wyc
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