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Throb
Throb got is name for the sound that it makes a throbbing type of sound.
It comes in three speeds of 4, 2 and 1 baud respectively. And uses 9 tones in a 72 or 144Hz bandwidth
My experiences with the mode it is a good performer
the slower bauds seems to be the most sensitive but can be very slow
And the highest speed 4/sec is not real sensitivity but has pretty good speed
And this modes doesn't use an FEC so, errors can be more common in bad conditions.