Re: [IRCA] More IBOC In Philly

["Rene Tetro" <rtetro@xxxxxxxxx>]

David,

I would suggest you check out the FCC Allocation Rules.  Most radio
stations are protected to their 0.5 mV/m contour.  Class A stations -
like WABC, WCBS, etc - are protected even more - out to their 0.1
contour.  0.5 mV/m is, and always has been considered to be a station's
"primary" coverage area, and is the contour used on most coverage maps.
This, of course, does not mean you're going to get a perfect signal at
these levels; it means that no other stations are allowed to cause
interference within that contour.  (We are, of course, talking daytime.
Nighttime is a whole different ball game).

Read FCC rules section 73.182 at 
http://a257.g.akamaitech.net/7/257/2422/12feb20041500/edocket.access.gpo
.gov/cfr_2004/octqtr/47cfr73.182.htm

City grade contour is something entirely different.  A station is
required to put 5.0 mV/m over their city of license.  Most put much
more, and under the old rules a signal of 25 mV/m was required over your
downtown area.

73,
Rene'



On Friday 23 September 2005 11:53, David Gleason wrote:
> I don't think a 0.5 contour is primary. The primary is 5 mvm, I
believe
> and the city grade is 25 mvm if I remember the definitions correctly.
In
> most urban areas, a 5 mvm contour will not produce much listening;
> consensus is that it takes about 10 mv/m or better to generate AM
> listening.




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