"A Brown" wrote in message
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"Pocket-Radio" wrote in message
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It’s too late for HD radio.

I recall people saying the same thing about FM. (And "stereo").

Neither took off until the FCC mandated inclusion of FM.


You are confusing the thing the FCC did do with something they did not do.

The FCC did mandate an end to AM and FM stations simulcasting the same
programming with a cutoff date in 1967.

There was a Senate bill to mandate FM on all radios back in the same era,
but the House did not pass it and it died.

FM, around since '39 or '40, was almost dead by 1960, with about half the
station count of 1950. FM stereo, a year later, was so unenthusiastically
received that it took two years to get 100 stereo stations one the air. It
was the no-simulcast rule that forced different and seemingly niche or
limited appeal programming onto the "broken apart" simulcasts.