I have never done RTTY but some friends have me intrigued. On the MK 5, there is a RTTY plug on the back. I ordered a rigblaster plus but from looking over the MP manual (after he could not get it to work) I found information there that leads me to believe that I do not need the rigblaster..Any one doing RTTY with MK5 who could shed some light on this...Thanks, 73 Tommy WD4K