As Scott Fybush said, there was never an FM mandate. AM only radios continued to be manufactured widely well into the 80's, with the later ones mostly novelty radios shaped like candy bars, cans of a branded motor oil, etc. Even after that date, a few could be found... mostly intended for sale in underdeveloped nations.One of my cars has HD radio, I really like it
Music in HD is wonderful, and I can listen to the only 2 AM stations in my market on their HD2 counterparts and it sounds infinitely better
The FCC should mandate it like they did FM and quality UHF tuners
Similarly, FM stereo was never mandated, although I have seen messages that believe it is required unless you get permission not to. AM stereo: never mandated, as it fell victim to delays and market forces.
Radio had no mandate comparable to the UHF requirement for TV; that one was real.
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