In article ,
rtc wrote:

Hello,

Well,if you mean the analog portion of the signal,on AM they only go
out to about 4900 hertz,which is about like a land line phone or a 78
rpm record. It is necessary because the total signal bandwidth would
wipe out even more nearby stations if they ran more audio on the
analog portion. If you mean the digital part,it is because it is only
running about 24 kilobytes per second,which is not even a poor MP3
quality. And the digital is subject to noise,static etc. so the
receiver will default to analog often in (most) instances.

Hope this helps.....

I don't claim to know what most stations do for bandwidth. All I know
is that before HD and on the stations that don't have it today I can
can keep opening the IF filter wider and the high end keeps improving
out to at least 12KHz, which means at least 6KHz audio bandwidth.

--
Telamon
Ventura, California