Check out the nice video at https://youtu.be/C96VB6MpI5I.
MT63 is a digital radio modulation mode for transmission in high-noise situations developed by Pawel Jalocha SP9VRC. MT63 is designed for keyboard-to-keyboard conversation modes, on HF amateur radio bands.
It is essentially a bunch of PSK carriers (64 to be exact) used to send data. If you go to MT63-2000, throughput of 200 wpm is possible (20.0 cps or 200 baud). That compares favorably to MFSK-32, which runs at 120 WPM. However, the bandwidth of MFSK-32 is only 630 hz, compared to the 2000 Hz occupied by MT63.
As you can see from the video, MT63 is very interference tolerant, allowing even a completely different mode to operate "on top of it". That is illustrated in the video link above. Our practical experience is that Olivia will win the contest of working the weakest signal, but when MFSK-32 is possible, MT63 is also possible with comparable results.
Yet another mode for your communication toolkit!
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