[Elecraft] [K3] GPIO input to switch output power with external amplifier on?

[Thomas Horsten]

Hi all,

I know that the K3 can remember a separate power level for transmitting
with an intelligent external amplifier like the KPA500, but I have an old
boat-anchor amplifier which I switch in and out with a simple switch
connected to the KEY OUT line of the K3.

Sometimes I am working barefoot on the K3 with 100W and then I decide I
need some extra power and turn on the amplifier. Then I have to turn the
drive down on the K3 to about 40W to drive the amplifier, but sometimes I
forget and the result is amplifier overdrive and burnt smell from the tubes.

It would be very nice if there was an input on the K3 that would switch to
the alternative per-band memory for drive power. It might already be there
and used for the KPA500, but I couldn't find it in the manual.

73, Thomas M0TRN