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Another problem with the cable is that it is strongly dispersive, ie different frequencies travel at very different velocities. This would have scrambled the scrambler.
Dial up modems can thru put 56Kb/s on a nominal 4kHz telephone line so 1500b/s is not so way out but as you say dispersion may be the problem, I don't think there would be any great problem doing it with modern electronics.Modern Vocoders use far less than 1500b/s
Dial up modems can thru put 56Kb/s on a nominal 4kHz telephone line
so 1500b/s is not so way out
Wouldn't that be a reason to convert from analog to digital?
With a digital signal, one can use essentially a single frequency carrier which should minimize the dispersion, although there would still be signal degradation.
How "real time" was this system?