[Elecraft] KPA500 - key down current on CW

[Ron D'Eau Claire]

Like virtually all "fixed tune" or "no tune" rigs, the efficiency and so
current demand varies widely with SWR since the output filters cannot be
adjusted to compensate. (There was an advantage to "dipping the final" in
the old rigs - it kept the efficiency up.)

Also, the efficiency and so current demand will change from band to band. In
general, the efficiency is lower on the higher frequency bands. 

Ron AC7AC