Interesting list of modes and tests ,
''Comments: Several European operators ++ have experimented with 45 Baud
RTTY using a narrow 23 Hz shift, with decent results. Our tests, however,
had limited success when compared to the various PSK or multitone FSK modes.
Given good signal strengths with little fading, you'll have good results and
will be hard-pressed to keep ahead of its typing buffer. I tried a 200 Hz
shift on a closed-circuit basis, and the weak signal performance was worse.
I had the idea that the narrow olivia test gave the best print over
distance , dose it not send more than one tone at any one time and
therefore require a linear transmission system ? was some chatter (not
monkey -please) that even the phase continuous modes like wspr actually need
a linear system to maintain modulation architecture and to prevent the
generation of 'gray noise' ??
PS: ++ must mean you and me Gary :)