[Elecraft] KX3 to Computer

[Forest Shick]

What is the easiest way to connect the KX3 to a computer for RTTY, PSK31 &
SSTV. I have purchased the cable set. I connect the KX3 - Phones connector
to the computer audio in and I can receive RTTY & SSTV. If I connect the
computer audio out to the KX3 MIC, the radio goes into transmit. I would
guess this is because the connector on the cable is incorrect for the MIC
connector - too few contacts.

 

So how do you connect the audio for transmitting?

Thank You