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)

"Mark Zenier" wrote in message
...

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)


As far as I know, all the IBOC stations have a maximum audio bandwidth of 5
kHz. 8 kHz AM audio bandwidth is supposed to be an option, but that
degrades the IBOC performance.

Frank Dresser

In article ,
"Frank Dresser" wrote:

"Mark Zenier" wrote in message
...

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)


As far as I know, all the IBOC stations have a maximum audio bandwidth of 5
kHz. 8 kHz AM audio bandwidth is supposed to be an option, but that
degrades the IBOC performance.

All I know is trying to listen to weak station the next channel over
(10KHz) either way is impossible.

--
Telamon
Ventura, California

But what are you hearing on that weak station? Certainly nothing that I
do not know already.I gave up dxining years ago.I only dx them crazy
wimmins all over (via the enternets) the World nowdays.I am doin better
than you are.
cuhulin

wrote:
But what are you hearing on that weak station? Certainly nothing that I
do not know already.I gave up dxining years ago.
.
cuhulin
"""""""""""""""""""""""""""""""""""""""""""""""""" """"""""""""""""""""
You don't understand. When you are driving around in the boonies in the
North there are no local stations to listen to. You can drive miles and
never see another car. There are more moose than people. At night all
the channels are filled with US stations with strong signals from the
clear channels. To add insult to injury, the few Canadian stations that
can be heard are covered up by the skip and if IBOC spreads the
sidebands will block them as well:. In the daytime, short wave
provides good signals. Just imagine tuning from 530khz to 1700 khz and
hearing nothing but hiss. This is the price you willingly pay to live
far away from cities. I think many city-dwellers would like to live in
the country if they could figure out a way to do it.

"Telamon" wrote in message
...

All I know is trying to listen to weak station the next channel over
(10KHz) either way is impossible.


I don't doubt it, but I don't try to daytime DX near IBOC stations. Mark's
information is consistant with my observations from the early days of IBOC,
when IBOC was commonly used at night and there was a hole between the AM
channel and each of the IBOC sidebands in which a first adjacent might punch
through the interference.

Frank Dresser