For what it's worth Rud, PSK31 appears much more susceptible to phase
distortion that wider modes such as MFSK and OLIVIA.
Here, we are just over 50 degrees north latitude and have many more
occasions to experience the
Northern flutter from the aurora. This phase distortion knocks out PSK31
Of course it is. PSK31 goes raw, while MFSK and Olivia have FEC added.
So, stand a better chance of being decoded correctly.
When nature starts stirring the gas above, all it reflects (refracts)
suffers the same effect as it had passed thru the house of mirrors,
making giants look like dwarfs
Rud,
You can see the variations in the ionosphere as a phase modulator
embedded in the channel. So, it will phase modulate whatever you attempt
to get thru it. Actually, it has a phase modulator embedded for each
arriving path.
With differential encoding, and signalling speed higher than the
