Sec.  87.451   Licensing limitations.

   Operational  fixed  stations  are  subject  to the following licensing
   limitations:

   (a) A maximum of four frequencies will be assigned.

   (b) Stations will not be authorized when applications indicate less than 16
   km (10 miles) separation between a proposed station and a TV transmitter
   operating on either Channel 4 or 5, or from the post office of a community
   in which either channel is assigned but not in operation.

   (c) Stations located between 16 km (10 miles) and 128 km (80 miles) of a TV
   transmitter operating on either Channel 4 or 5, or from the post office of a
   community in which either channel is assigned but not in operation, are
   secondary to TV operations within the Grade B service contour.^1

   ^1 OET Bulletin No. 67, March 1988, entitled “Potential Interference from
   Operational Fixed Stations in the 72–76 MHz Band to Television Channels 4
   and 5” describes an analytical model that can be used to calculate the
   potential  interference  that  might result from a given fixed station
   operation. Copies of the bulletin may be obtained from the Commission's
   current  duplication  contractor.  Information  concerning the current
   duplication contractor may be obtained from the Office of Public Affairs,
   Consumer Assistance and Small Business Division, Telephone (202) 632–5050.

Subpart Q—Stations in the Radiodetermination Service