[Elecraft] ALC control of W6PQL amp from my K3

Bob McGraw K4TAX rmcgraw at blomand.net
Sat Mar 9 13:23:30 EST 2019


I would emphasize with the K3S and KPA500, if one follows the set-up 
EXACTLY as described in the KPA500 manual page 16 & 17, and in the K3S 
manual page 29 & 59,  all will be well with the EXT ALC engaged.    
Anything else will be a PICNIC problem.

I suggest the set-up be done with a 50 ohm resistive dummy load 
connected to the amplifier.   Therefore any major deviation in output 
load will then provide a margin of safety via the ALC. Correctly set-up 
one can then observe any excessive drive applied to the amplifier or a 
load which exceeds the recommended load range by an indication on the 
transceiver ALC indicator.    This ONLY applies to the K3S and KPA500 as 
described.

73

Bob, K4TAX





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