So far I have seen individual waveforms of approximately 2, 3, 4, and 10 kHz widths. Each can be found at various speeds, from slow to fast. The same data structure, down to the same MFSK step cycles, but scaled differently, can be seen on both the 4 and 10 KHz widths. Different speeds can have the same MFSK step cycles, just slowed down or sped up. I have seen every size alone, and every size with one, or more, companion signal(s). I have seen up to three examples in close proximate, say within 50'ish kHz of each other. I have also seen multiple sets of signals up, sometimes several MHz apart. So far I have not observed more than three wide spaced sets up at any one time, for example a set at 10244 kHz, a set at 11448 kHz, and a set at 14892 kHz, all at the same time.
I do not have the skill or software tools to determine if each MFSK bit also has some other modulation on it, like possibly PSK data on each MFSK step. But the MFSK steps cannot be the entire data content for the signal, as those go for extended periods without change.
T!