|
In the U.S., The first AM stereo was in the early 1980s, there were competing systems at that time...by the mid-late 1980s the Motorola C-QUAM system was the standard. Stations have been discontinuing AM stereo more in recent years with less music programming on AM and the advent of digital AM broadcasting.
The first FM stereo was in 1963 I believe.
Also in the late 50's/early 60's, some stations did stereo by broadcasting one channel of audio on an AM station and the other on an FM.
|