de VK4TS Correct me if I am wrong - a question for the gurus.. RTTY is generated by two main methods Audio Shift Keying AFSK and Frequency Shift Keying FSK - the difference is remarkable. Using AFSK using the SSB audio path setting of audio levels are critical and over driving is a problem. Using FSK is basically the same as CW there is a carrier and the radio moves the frequency between the two points. Because it is CW there is no audio setting issues, rigs run cooler and power can be increased. FT8 is a series of audio tones that are driven down the audio path and susceptible to over driving. Could FT8 be adopted to a true frequency shift keying format that keys the rig without using the AFSK audio path, varying the frequency via the serial port thus allowing a better interface, greater power and better efficiency?