[Elecraft] KPA500 Fan Question

[Jim Brown]

On 7/3/2018 6:24 AM, Bob McGraw K4TAX wrote:
> In running my KPA500 on FT-8 mode at about 400 watts output, what is 
> the recommended setting for Fan CTL?    I usually keep it in NORmal 
> but have tried other settings. 

Nearly all of my FT8 operation is on 6M, where the KPA500 is least 
efficient, and where my antenna looks like about 1.5:1 in the shack. I'm 
running meteor scatter and weak signal work, which means I'm 
transmitting on almost every cycle. To keep TEMP relatively low, I set 
the fan to either max speed or one step down. Into a different antenna 
on FD, the same amp ran significantly cooler. Using an LP100A power 
meter, I get at least 500W out on 6M, sometimes as much as 550W.

73, Jim K9YC