Yves, VE2ATD, wrote: "I want to use my K2 on digital modes."
Yves, I'm running a K2-100. *Audio to and from it is through the microphone connection using modifications described by LA3ZA (http://www.qsl.net/ve3mcf/elecraft_reflect/K2_Audio_Output_Port.txt). *Audio isolation from the computer is provided by two transformers removed from old modems. *I have the KIO2 I/O module, so PTT is done through CAT commands. *fldigi is my digital software (http://www.w1hkj.com/Fldigi.html), which also allows me to use flarq (http://www.w1hkj.com/flarq_main.html) and PSKmail (http://pskmail.wikispaces.com/). -- Kent VE4KEH