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A lot of the advantage of the AM stereo radios is that they had a wider IF bandwidth (some only when a stereo signal was detected). I used to work at an AM station that was in stereo, we used a Carver tuner to monitor the station. The stereo separation was not quite as good as on FM, but you could definitely hear that stereo program material was coming through as stereo.
The major systems were Motorola C-QUAM and Kahn...there was also a Magnavox and other systems proposed in the early 80's when AM stereo was being developed. I think eventually the FCC might have mandated the Motorola system be used...this is what all the stations were using in the 90's.
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