wrote in message
ups.com...
On Mar 5, 7:36?pm, "David Eduardo" wrote:
"Guerite" wrote in message

...



and with only 60% the coverage of analog.

Using 1/100th the power of the equivelent analog's signal carrier. Thus
a
power savings to the station.

And, as discussed, on FM the "used" coverage area is the 64 dbu curve.
Over
80% of listening is in the 70 dbu, and the rest in the 64 to 69 dbu
contour.

The HD signal at least matches the 64 dbu useful and used contour. On AM,
the HD signal is often listenable beyond the "used and useful" contour of
the analog signal.

HD/IBOC causes adjacent-channel interference and has only 60% the
coverage of analog.

There is a difference between arbitrary signal contours and a usable signal.
The FM HD coverage is about the same as the usable, useful FM analog signal,
and in noisy markets, the AM HD in some cases extends beyond the usable
analog contour, especially at night if the protected contour is a high
value.