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In 1982 the FCC allowed stations to apply for C-QUAM [1] operation. Don't let the OP fool you, it uses a nearly identical technique to FM stereo and thus has
by akira2501 9y ago
In 1982 the FCC allowed stations to apply for C-QUAM [1] operation. Don't let the OP fool you, it uses a nearly identical technique to FM stereo and thus has nearly the same limitations and impact on quality of the station.
Or he's thinking about 1989 when the FCC actually limited AM bandwidth to 20kHz (10kHz audio).
[1]: https://en.wikipedia.org/wiki/C-QUAM https://en.wikipedia.org/wiki/C-QUAM