[Elecraft] KPA-1500 wish list

[Andy Durbin]

"(It could also be done entirely external to the KPA1500 by replicating its power sensing circuitry, a bit of a waste.) It's not trivial but I'm convinced it's
possible."

I'm no expert on amplifier design but wouldn't it be more appropriate to have (slow) closed loop control of the amplifier gain?  Couldn't that be done internal to the KPA1500 without any need to control exciter drive power?  

If the gain gain change is caused mainly by PA temperature changes couldn't that be compensated open loop.  The finals temperature is already known to the controller.

Why develop a complex closed loop power control system if the problem could be fixed by stabilizing the amplifier gain?

Andy, k3wyc