I want to use my KX3 with an HP-100 in a portable configuration. Am I missing something? I can use the HP-100 in the TTY mode with the KX3 "TT" command to recieve text and it works very well. I can not find a similar KX3 command to transmit. Do I need a DOS (Yes old DOS) program that will send the codes and format? John K7JLT