Goto Section: 73.317 | 73.319 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 73.318 FM blanketing interference.
Areas adjacent to the transmitting antenna that receive a signal with a
strength of 115 dBu (562 mV/m) or greater will be assumed to be
blanketed. In determining the blanketed area, the 115 dBu contour is
determined by calculating the inverse distance field using the
effective radiated power of the maximum radiated lobe of the antenna
without considering its vertical radiation pattern or height. For
directional antennas, the effective radiated power in the pertinent
bearing shall be used.
(a) The distance to the 115 dBu contour is determined using the
D (in kilometers) = 0.394√ P
D (in miles) = 0.245√ P
Where P is the maximum effective radiated power (ERP), measured in
kilowatts, of the maximum radiated lobe.
(b) After January 1, 1985, permittees or licensees who either (1)
commence program tests, or (2) replace their antennas, or (3) request
facilities modifications and are issued a new construction permit must
satisfy all complaints of blanketing interference which are received by
the station during a one year period. The period begins with the
commencement of program tests, or commencement of programming utilizing
the new antenna. Resolution of complaints shall be at no cost to the
complainant. These requirements specifically do not include
interference complaints resulting from malfunctioning or mistuned
receivers, improperly installed antenna systems, or the use of high
gain antennas or antenna booster amplifiers. Mobile receivers and
non-RF devices such as tape recorders or hi-fi amplifiers (phonographs)
are also excluded.
(c) A permittee collocating with one or more existing stations and
beginning program tests on or after January 1, 1985, must assume full
financial responsibility for remedying new complaints of blanketing
interference for a period of one year. Two or more permittees that
concurrently collocate on or after January 1, 1985, shall assume shared
responsibility for remedying blanketing complaints within the
blanketing area unless an offending station can be readily determined
and then that station shall assume full financial responsibility.
(d) Following the one year period of full financial obligation to
satisfy blanketing complaints, licensees shall provide technical
information or assistance to complainants on remedies for blanketing
[ 28 FR 13623 , Dec. 14, 1963, as amended at 52 FR 25866 , July 9, 1987]
Goto Section: 73.317 | 73.319
Goto Year: 2020 |
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