Sec. 101.509  Interference protection criteria.

    (a) All harmful interference to other users and blocking of adjacent 
channel use in the same city and cochannel use in nearby Standard 
Metropolitan Statistical Areas is prohibited. In areas where SMSA's are 
in close proximity, careful consideration should be given to minimum 
power requirements and to the location, height, and radiation pattern of 
the transmitting antenna. Licensees and applicants are expected to 
cooperate fully in attempting to resolve problems of potential 
interference before bringing the matter to the attention of the 
Commission.
    (b) As a condition for use of frequencies in this service each 
carrier is required to:
    (1) Engineer the system to be reasonably compatible with adjacent 
channel operations in the same city; and
    (2) Cooperate fully and in good faith to resolve whatever potential 
interference and transmission security problems may be present in 
adjacent channel operation.
    (c) The following interference studies, as appropriate, must be 
included in DEMS Nodal Station applications to the extent they are 
provided for in this subpart:
    (1) An analysis of the potential for harmful interference with other 
stations if the coordinates of any proposed station are located within 
80 kilometers (50 miles) of the coordinates of any authorized, or 
previously proposed station(s) that utilizes, or would utilize, the same 
frequency or an adjacent potentially interfering frequency; and
    (2) An analysis concerning possible adverse impact upon Canadian 
communications if the station's transmitting antenna is to be located 
within 55 kilometers (35 miles) of the Canadian border.
    (d) In addition a copy of the interference analysis submitted in 
response to paragraph (c)(1) of this section must be served on all 
applicants and/or grantees concerned within 5 days of its submission to 
the Commission.
[ 61 FR 26677 , May 28, 1996, as amended at  62 FR 24583 , May 6, 1997]