Goto Section: 90.255 | 90.259 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 90.257 Assignment and use of frequencies in the band 72-76 MHz.
(a) The following criteria shall govern the authorization and use of
frequencies within the band 72-76 MHz by fixed stations. (For call box
operations see § 90.241).
(1) The following frequencies in the band 72-76 MHz may be used for
(2) All authorizations are subject to the condition that no harmful
interference will be caused to television reception on Channels 4 and
(3) The applicant must agree to eliminate any harmful interference
caused by his operation to TV reception on either Channel 4 or 5 that
might develop by whatever means are necessary. Such action must be
taken within 90 days of notification by the Commission. If such
interference is not eliminated within the 90-day period, operation of
the fixed station will be discontinued.
(4) Vertical polarization must be used.
(5) Whenever it is proposed to locate a 72-76 MHz fixed station less
than 128 km (80 mi.) but more than 16 km (10 mi.) from the site of a TV
transmitter operating on either channel 4 or 5, or from the post office
of a community in which such channels are assigned but not in
operation, the fixed station shall be authorized only if there are
fewer than 100 family dwelling units (as defined by the U.S. Bureau of
the Census), excluding units 112 or more km (70 mi.) distant from the
TV antenna site, located within a circle centered at the location of
the proposed fixed station. The radius shall be determined by use of
the following chart entitled, "Chart for Determining Radius From Fixed
Station in 72-76 MHz Band to Interference Contour Along Which 10
Percent of Service From Adjacent Channel Television Station Would Be
Destroyed." Two charts are available, one for Channel 4, and one for
Channel 5. The Commission may, however, in a particular case, authorize
the location of a fixed station within a circle containing 100 or more
family dwelling units upon a showing that:
(i) The proposed site is the only suitable location.
(ii) It is not feasible, technically or otherwise, to use other
(iii) The applicant has a plan to control any interference that might
develop to TV reception from his operations.
(iv) The applicant is financially able and agrees to make such
adjustments in the TV receivers affected as may be necessary to
eliminate any interference caused by his operations.
(v) All applications seeking authority to operate with a separation of
less than 16 km (10 mi.) will be returned without action.
(b) The following criteria governs the authorization and use of
frequencies in the 72-76 MHz band by mobile stations in the
(1) Mobile operation on frequencies in the 72-76 MHz band is subject to
the condition that no interference is caused to the reception of
television stations operating on Channel 4 or 5. Interference will be
considered to occur whenever reception of a regularly used television
signal is impaired by signals radiated by stations operating under
these rules in the 72 to 76 MHz band regardless of the quality of such
reception or the strength of the signal used. In order to minimize the
hazard of such interference, it shall be the duty of the licensee to
determine whether interference is being caused to television reception,
wherever television receivers other than those under the control of the
licensee, are located within 31 m. (100 ft.) of any point where the
stations licensed under these rules may be operated. In any case, it
shall be the responsibility of the licensee to correct, at its own
expense, any such interference and if the interference cannot be
eliminated by the application of suitable techniques, the operation of
the offending transmitter shall be suspended. If the complainant
refuses to permit the licensee to apply remedial techniques which
demonstrably will eliminate the interference without impairment of the
original reception, the licensee is absolved of further responsibility.
(2) The maximum transmitter output power that will be authorized is 1
watt; and each station authorized will be classified and licensed as a
mobile station. Any units of such a station, however, may be used to
provide the operational functions of a base or fixed station. The
antennas of transmitters operating on these frequencies must be
directly mounted or installed upon the transmitting unit: Except that
when permanently installed aboard a vehicle, antenna and transmitter
may be separated as required for convenience in mounting. Horizontal
polarization will not be allowed; and the gain of antennas employed
shall not exceed that of a halfwave dipole. The maximum bandwidth that
will be authorized is 20 kHz. Tone control transmissions are permitted.
(c) Radio remote control of models is permitted on frequencies 10 kHz
removed from these frequencies authorized for fixed and mobile
operations in the 72-76 MHz band. Remote control operations are
secondary to operation of fixed and mobile stations as provided for in
eCFR graphic ec02ap91.008.gif
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[ 43 FR 54791 , Nov. 22, 1978; 44 FR 32219 , June 5, 1979, as amended at
47 FR 51879 , Nov. 18, 1982; 49 FR 41249 , Oct. 22, 1984; 54 FR 38681 ,
Sept. 20, 1989; 58 FR 30129 , May 26, 1993; 60 FR 37268 , July 19, 1995;
62 FR 18928 , Apr. 17, 1997; 72 FR 35196 , June 27, 2007]
Goto Section: 90.255 | 90.259
Goto Year: 2019 |
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