The 5k restriction was only imposed to avoid adjacent station interference; I'm sure the technology was capable of a much broader bandwidth. I'm sure; however, that there is some sort of formula, similar to the Nyquist formula, that dictates what multiple of the highest audio frequency to be reproduced the minimum carrier frequency must be, but I'm not familiar with such a formula.
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> On Sep 30, 2015, at 12:15 PM, Michael Shoshani <[log in to unmask]> wrote:
> To address Dave Burnham's original post, which I somehow missed:
>> Theoretically AM broadcasting should be capable of a 5k bandwidth.
> According to historian Fred Krock, up until the mid-1940s, network radio actually carried a maximum of 8k bandwidth. Station crowding wasn't as much of a problem as it is today, I suppose.
> Michael Shoshani