[Elecraft] MMTTY FSK

[Richard Ferch]

Brett Howard wrote:
 > I do see FSK as a method that is slightly less prone
 > to TX distortions.

You might be surprised. In my setup I can switch back and forth 
instantly between FSK and AFSK. I have done some testing with a second 
receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK 
(lower odd-order sidebands). My guess is that this is due to keying 
transients in FSK. I assume the AFSK from MMTTY uses some form of 
waveform shaping or phase-coherent transitions between the two tones, 
resulting in lower keying transients.

73,
Rich VE3KI