[Elecraft] KPA100 oscillation during IARU Reg 1 Field Day

[Chuck Gehring]

---- "Darwin wrote: 
> And a related question.  At what power level does the fan come on?  
> -----Original Message-----
> It always bothers me when the fan comes on even though I realize that it
> is normal and desirable behavior. 

IMHO
It  is my understanding the the Power transistors in the KPA-100 (2SC2879) are rated for 100W SSB PEP for each, and with that HUGE heat sink I would expect the KPA-100 to loaf along fine at 100 watts CW, 30 wpm for two minutes.  I have seen a few posts where folks have added additional fans.  The fan is temperature controlled it will turn on high when the heat sink temp goes above 40 degrees C and turn off two minutes after the temp goes below 37 degrees C.  For me, I like it when the fan turns on, it is letting me know that my KPA-100 is functioning as it was designed.
73 KI4DGH
Chuck G.