IBOC requires the AM sidebands to be kept under 5kHz because of
the Digital Sidebands. Fortunately, the stations running IBOC are
getting a lot of flack from listeners regarding the horrid AM bandwidths.


Actually, there is an IBOC mode where the analog signal extends to 8
kHz. This overlaps the digital signal occupying 5 to 10 kHz and lowers
its data rate. I think the station can pick whichever analog bandwidth
it wants (that is, I don't think the decision is subject to FCC
rules).

Brian