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Anybody remember "simulcast?"
Yes simulcast was an experimental way to broadcast stereophonic sound over radio in the late 1950s before the FCC adopted and approved the standards for the FM multiplex system we've used ever since. How did it work? In many cities, radio stations would broadcast on both an AM channel and an FM channel. In simulcast, one station would broadcast the right channel and the other the left. There are radio tuners designed specifically for this purpose. I have one of the rare ones, a 1960 vintage Capehardt DM2800 console set up for this purpose. .
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