Early experiments with Stereo radio broadcasting involved two separate stations broadcasting the Left and Right audio channels. Consumers did not accept this This Rube-Goldberg set up as it was just as ridiculous as it sounds.
In the early 1980s four competing AM systems went on air. These were:
- Motorola (C-QuAM)
- Magnavox (PMX)
- Kahn-Hazeltine (ISB)
- Harris Broadcast (V-CPM)
- Belar System
AM Stereo timeline Highlights:
- 1960 - AM Stereo first demonstrated on XETRA-AM, Tijuana, MX, using the Kahn ISB system.
- 1963 - WHAZ runs a stereo program on eight AM stations, four on each channel.
- 1984 - The FCC begins AM Stereo testing with five systems. Initially they select the Magnavox system. Their research is immediately accused of being flawed and incomplete.
- 1993 - FCC makes Motorola's C-QUAM the AM stereo standard. This sets off another series of lawsuits and accusations resulting in the FCC deciding that the marketplace should decide. The marketplace decides to continue fighting like children and this becomes a death blow to the possibility of AM stereo.
There are still over 100 stations still chugging along with stereo broadcast...
one that no one can receive, they are listed here.