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\
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    \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.
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          Subpart Q--Stations in the Radiodetermination Service