Sec.  73.6010   Class A TV station protected contour.

   (a) A Class A TV station will be protected from interference within the
   following predicted signal contours:

   (1) 62 dBu for stations on Channels 2 through 6;

   (2) 68 dBu for stations on Channels 7 through 13; and

   (3) 74 dBu for stations on Channels 14 through 51.

   (b)  The  Class  A TV station protected contour is calculated from the
   effective radiated power and antenna height above average terrain, using the
   F(50,50) charts of Figure 9, 10 or 10b of  Sec. 73.699 of this part.

   (c) A digital Class A TV station will be protected from interference within
   the following predicted signal contours:

   (1) 43 dBu for stations on Channels 2 through 6;

   (2) 48 dBu for stations on Channels 7 through 13; and

   (3) 51 dBu for stations on Channels 14 through 51.

   (d) The digital Class A TV station protected contour is calculated from the
   effective radiated power and antenna height above average terrain, using the
   F(50,90) signal propagation method specified in  Sec. 73.625(b)(1) of this part.