Dane,

I am fairly certain that we used both in the US and that the Motorola system 
was slightly more common in the end, 
but it was never controlled as you said and that likely hurt its chances to 
succeed.  However, FM really took off 
here in the 80's and 90's and that also probably hurt and may have been the 
biggest reason that AM Stereo didn't 
make it.  Who knows.

Best regards,

Steve Jacobson

On Thu, 10 Apr 2014 12:10:19 +1000, Dane Trethowan wrote:

>Hi!

>Okay, it seems that Australia used the Motoroller method for transmitting 
>Stereo AM in the end after a battle in 
court over here, the U.S. apparently used the Magnavox method or the Haris 
method, nothing was tightly controlled 
by the FCC until it was far too late <smile>.



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