[Elecraft] K2 build completed. RS-232 no go yet

[W. Wright, W5XD]

The hint I needed to solve my RS-232 port problem came from Gary, AB7MY.
Its working now. This info is in the manual, but I didn't read it 
correctly, nor did I follow it correctly, nor did I notice its 
importance when I was scouring the manual for hints after I knew I
had a problem.

IMPORTANT: 

Note that the sidetone source MUST be set to U8-4 when using the KPA100
or KIO2. This switches the sidetone source from U6-25 so it can be used
as a data pin. This entry is accessed by editing the St L menu, and then
pressing the DISPLAY button to toggle between U6-25 and U8-4.

Thanks,
Wayne, W5XD