[BC] Analog AM bandwidth: tail wagging the dog?

[Robert Orban]

At 04:23 PM 10/3/2007, you wrote:
>On Tue, 2 Oct 2007 22:45:56 -0700 (PDT)
>Kevin Tekel <amstereoexp at yahoo.com> wrote:
>
> > Based on a study of 30 receivers, the NRSC recommends an analog AM
> > audio bandwidth of 7 kHz.
>
>Is that the study where they tested not just with single
>signals, but also with adjacant-channel signals of varying
>strengths?
>
>In that case, reducing the bandwidth of both signals will
>reduce interference heard when listening to the wanted signal
>and a 7kHz bandwidth makes sense.

Yes. 7 kHz bandwidth prevents first-adjacent sidebands from 
encroaching into the 0 to 3 kHz region where a typical radio has 
reasonable response.

Bob Orban