Whatever Happened To Stereo AM Radio Testing?

Big L 266

New member
Hello.

Many years ago, a brief dubious flirtation was made by engineers to create high quality stereo radio broadcasting on the old Medium Wave (or latterly AM) frequencies. Do you happen to know what the outcome was and why it never made it off the drawing board or beyond any test transmissions please?

Thank you for your help.

Big L 266
 
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