On Sat, 29 Sep 2007 06:56:42 -0400, Ron Hardin
wrote:

David wrote:

On Fri, 28 Sep 2007 11:15:12 -0400, Ron Hardin
wrote:

Rfburns wrote:

Does anyone know of a broadcaster who's turned off their AM HD since
nighttime operation started?

Nobody in Columbus Ohio is broadcasting HD at night, with about 3 stations
with it in the day. WOSU 820 WTVN 610 WCOL 1230 (or whatever they're
calling themselves now).

Actually WCOL might be using it but nobody would be able to tell, at night.
Nobody can hear it.

They should sound killer within 15 or 20 miles of the transmitter.

http://www.fccinfo.com/CMDProEngine....10089&sHours=U

No, the limiting thing is what else you can hear, not what
their power contours are. There's a thousand skywaves on the
frequency just as strong, at night.

That's the benefit of having a clear channel and contour protection, which
no longer applies on most frequencies.

I'm very familiar with the graveyard freqs. I enjoy listening to KOY
at night when I'm in Tempe. They have a pretty much identical setup
as the Columbus station.