In article om,
ve3... wrote:
....
I knew it couldn't be IBOC interference because promoters on this
very website have assured us that the sidebands were so weak that they
wouldn't bother disant listeners. Well, I have news. They were lying
through their teeth. WCCO 830 Minneapolis took out 820 and 840, 700
WLW Cincinatti took out 690 Montreal and 710, 1180 WHAM took out 1170
and 1190, and 1110 took out 1100 and 1120. These were identified
before morning fade-out.

From the theory stuff I read off the web, the worst IBOC interference
should be on the station 20 kHz away, as the sideband(s) for the primary
digital channel are on 15-25 kHz (on both sides) from the carrier.
Unless the IBOC station had reduced their analog bandwidth and were
using the second channel (which runs from 5-15 kHz, both sides).

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)