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I believe we are in agreement about this but let me respond to your query:
>I need clarification of the statement,”it is very important not to >overmodulate and secondarily to limit the audio bandwidth.”
By “overmodulate” I had in mind clipping on the negative peaks which pinches off the carrier. When this happens very wide band audio harmonics are produced in the sidebands resulting in wide band interference. Sharp limiting on the positive peaks can have the same result.
By “secondarily limit the audio bandwidth” I was ascribing less importance to this than to the carrier pinchoff situation since this will not produce audio harmonics and the RF bandwidth will be less than overmodulation produces. My comments are for part15 and not commercial stations. I do agree and recommend that part15 AM operators should limit their audio bandwidth to 10 kHz., but I don’t see a lot of harm if they don’t. High audio bandwidth would be a waste of power in the sidebands to no good effect at superaudible frequencies.
Hope this helps.
Also, thanks for your comment about receivers. I have not kept up with that technology so I found it informative.