In article ,
"David Eduardo" wrote:

"Telamon" wrote in message
...

But about 95% of measured listening occurs inside the 64 dbu contour, and
80% is inside the 70 dbu contour.

As defined by the ability of HD to perform at all. A self fulfilling
outcome.


I should have been clearer... 95% of analog FM listening is inside the 64
dbu contour.

The last time I looked the FM radio in my car didn't have the ability to
differentiate which side of the 64 dBu coverage line it was on.

--
Telamon
Ventura, California

Telamon wrote:
In article ,
"David Eduardo" wrote:

"Telamon" wrote in message
...
But about 95% of measured listening occurs inside the 64 dbu contour, and
80% is inside the 70 dbu contour.
As defined by the ability of HD to perform at all. A self fulfilling
outcome.

I should have been clearer... 95% of analog FM listening is inside the 64
dbu contour.

The last time I looked the FM radio in my car didn't have the ability to
differentiate which side of the 64 dBu coverage line it was on.


I remember 64 dBu as a TV term. In radio it was 60 dBu (aka 1 mV/m; aka
Grade B Contour). Perhaps it has since been modified, as I retired from
radio about 20 years ago (when people stopped "listening").

"Telamon" wrote in message
...
In article ,
"David Eduardo" wrote:

"Telamon" wrote in message
...

But about 95% of measured listening occurs inside the 64 dbu contour,
and
80% is inside the 70 dbu contour.

As defined by the ability of HD to perform at all. A self fulfilling
outcome.


I should have been clearer... 95% of analog FM listening is inside the 64
dbu contour.

The last time I looked the FM radio in my car didn't have the ability to
differentiate which side of the 64 dBu coverage line it was on.


Listeners can differentiate, quite obviously, between signals that come in
nicely and those that don't. Of course, depending on the actual location and
type of radio, what we see is that listening becomes less and less common
(even when indexed against population density) the farther you go from the
transmitter. Once you get outside the 70 dbu contour, listening falls to
nearly nothing approaching the zone around the 64 dbu. It's a question of
listening density, indicating that listeners will not go to the trouble as
the signal gets weaker, particularly if they have other options.