"C/MT Hell or concurrent multitone Hell sends all rows at the same time using
tones at different frequencies. The transmission can be read using an FFT
display. It allows for high resolutions."
"S/MT Hell or sequential multitone Hell is like C/MT but with a discrete number
of tones (characters are restricted to 5x7 pixels). "
You're probably watching a C/MT or S/MT Hell transmission.
73 de Donald
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