[Elecraft] K3 / KX3 Key Jack

[Joel Black]

Okay, I think I am losing my mind.  Is the K3 key jack stereo or mono?  
I know I only use two wires for a key, but for some reason, I have a 
stereo (TRS) plug on my key cable.  I cannot find what I'm looking for 
in the manual either.

I don't think the wiring for the KX3 matters (either T or R is used for 
keying with a straight key if set for HAND).

I'm building an external keyer that I'm going to use with both a paddle 
and a straight key.  I also want to switch the output of the keyer 
between the K3 and the KX3 so I don't have to swap cables all the time.

73,
Joel - W4JBB