[Elecraft] K3 KAT3 power during tune?

[Sam Morgan]

I see in the manual, under CONFIG TUNE
it says:
"Note1: TUN PWR does not pertain to ATU TUNE , which always uses 5
or 10 W and is internally controlled."

what determines if 5 or 10 watts is being used?
-- 
GB & 73
K5OAI
Sam Morgan