On Thu, 12 Mar 2009 22:42:11 -0700, David Eduardo wrote:



HD hardly uses any electrical. A sidelight on a tower uses more than
most.

That's nice. Would profit pressed pennypinchers keep that light on if it
weren't required by the insurance company or the government?


Citadel turned of HD on a couple of AMs which were interfering at night,
WABC an WJR.


That's odd. I had the impression that IBOC interference had no
significant effect beyond the FCC protected contour.

I'd expect there was a significant reason for turning the noisemakers off
at night, as the costs of cycling the IBOC transmitters would be more
than the costs of the electricity. That is, if they intend to repair
them as they break down.

Frank Dresser

"Frank" wrote in message
...
On Thu, 12 Mar 2009 22:42:11 -0700, David Eduardo wrote:



HD hardly uses any electrical. A sidelight on a tower uses more than
most.

That's nice. Would profit pressed pennypinchers keep that light on if it
weren't required by the insurance company or the government?


Citadel turned of HD on a couple of AMs which were interfering at night,
WABC an WJR.


That's odd. I had the impression that IBOC interference had no
significant effect beyond the FCC protected contour.


That's what IBOC shills would have you believe, but it has been demonstrated
many times now that this is not the case, and that significant sideband
interference from the IBOC sidebands is caused via skywave at nighttime.
Please note that it takes a significantly smaller signal to cause
interference than it does to actually HEAR the signal itself. Because of
this, those IBOC sidebands can and do interfere with stations in an area
where those same sidebands would not be copyable.

On Fri, 13 Mar 2009 22:15:36 +0900, Brenda Ann wrote:




That's what IBOC shills would have you believe, but it has been
demonstrated many times now that this is not the case, and that
significant sideband interference from the IBOC sidebands is caused via
skywave at nighttime. Please note that it takes a significantly smaller
signal to cause interference than it does to actually HEAR the signal
itself. Because of this, those IBOC sidebands can and do interfere with
stations in an area where those same sidebands would not be copyable.

True, and add to that the directional effect of the typical AM loopstick
antenna. For example, a person might be listening in the evening to,
say, WLS with the station in the antenna's near null area. This is no
problem if the signal strength is good and the interference is low. But
the antenna in that position is likely to be near broadside to the WCBS
transmitter and the listener will get the extra noise.

Frank Dresser