I sent this to 700 WLW's link, for questions concerning IBOC - it was
very nice of Darryl to respond so quickly, but he dodged a lot of my
questions/concerns::

Hello,


I have heard and read many negative reviews concerning HD/IBOC,
especially, how it will negatively affect nightime AM DXing. I live
and Maryland, and very much enjoy listening to Scott Sloan, but I am
very concerned that it will be very difficult, because tests with WOR,
in New York, running HD/IBOC caused much interference with WLW. Also, I
understand that an HD/IBOC exciter, and possible expensive
modifications to antenna systems (to modify the bandwidth), along with
a yearly fee to iBiquity, makes this technology very expensive. Tests
with daytime IBOC have caused much adjacent-channel interference, poor
quality transmissions from the digital sidebands dropping out (it's
all-or-nothing with digital), and poor penetration and coverage of the
digital signal. Luckily, nightime IBOC, has not yet been approved and,
hopefully, never will. Was your station pressured by Clear Channel and
iBiquity to run IBOC ? Also, I have read that a number of stations
have turned off HD/IBOC, because off listener complaints and
adjacent-channel interference. I hope your station doesn't "shoot
iteself in the foot", by running HD/IBOC, thereby cutting off many AM
DXers ! I would appreciate any thoughts on this, when you get a chance.


AND the response from Darryl at 700 WLW:

Actually, one of the first IBOC test stations years ago was 700WLW.
The system has been improved a lot over the years. The interference
comes from the digital signal being on the sidebands of the main
carrier. One of the things that Clear Channel has done has required
the AM's roll off at 5k, which actually is a good thing reducing
interference and allow the smart stations to make the signal more dense

and loud.

You are correct with the issues in digital transmission...it's either
there are not and this with lower power stations may still be an issue.

As far as antenna modifications for bandwidth, being a non-direction
station 700WLW is OK with minor issues. We did have the HD signal on
for a few weeks a few months ago and did turn it off because of
processing issues. The new equipment has arrived and at some point we
will begin experimenting with HD again.

Although, there are problems, no pain...no gain. We live in a digital
world. We all need to embrace the future...or it will run us over.

Thank you for listening. We'll continue to make more.

Darryl Parks
700WLW


Here are a couple of good IBOC links:

http://www.wbdhradio.com/html/say_no_to_iboc.html
http://topazdesigns.com/iboc/station-list.html
http://beradio.com/features/radio_running_interference/