Sec. 74.502  Frequency assignment.

    (a) Except as provided in US 302, broadcast auxiliary stations 
licensed as of November 21, 1984, to operate in the band 942-944 MHz \1\ 
may continue to operate on a co-equal primary basis to other stations 
and services operating in the band in accordance with the Table of 
Frequency Allocations. These stations will be protected from possible

[[Page 402]]

interference caused by new users of the band by the technical standards 
specified in Sec. 94.63(d)(3).
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    \1\ Note: In addition to this band, stations in Puerto Rico may 
continue to be authorized on 942.5, 943.0, 943.5, 944.0 MHz in the band 
942-944 MHz on a primary basis to stations and services operating in 
accordance with the Table of Frequency Allocations.
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    (b) The frequency band 944-952 MHz is available for assignment to 
aural STL and ICR stations. AM and FM broadcast stations shall have 
primary use of the band; however, TV broadcast stations may be licensed 
on a secondary, noninterference basis. One or more of the following 25 
kHz segments may be stacked to form a channel which may be assigned with 
a maximum authorized bandwidth of 300 kHz except as noted below. The 
channel, will be assigned by its center frequency, channel bandwidth, 
and emission designator. The following frequencies are the centers of 
each segment:

944.0125, 944.0375, 944.0625, 944.0875, 944.1125, 944.1375, 944.1625, 
944.1875, 944.2125, 944.2375, 944.2625, 944.2875, 944.3125, 944.3375, 
944.3625, 944.3875, 944.4125, 944.4375, 944.4625, 944.4875, 944.5125, 
944.5375, 944.5625, 944.5875, 944.6125, 944.6375, 944.6625, 944.6875, 
944.7125, 944.7375, 944.7625, 944.7875, 944.8125, 944.8375, 944.8625, 
944.8875, 944.9125, 944.9375, 944.9625, 944.9875, 945.0125, 945.0375, 
945.0625, 945.0875, 945.1125, 945.1375, 945.1625, 945.1875, 945.2125, 
945.2375, 945.2625, 945.2875, 945.3125, 945.3375, 945.3625, 945.3875, 
945.4125, 945.4375, 945.4625, 945.4875, 945.5125, 945.5375, 945.5625, 
945.5875, 945.6125, 945.6375, 945.6625, 945.6875, 945.7125, 945.7375, 
945.7625, 945.7875, 945.8125, 945.8375, 945.8625, 945.8875, 945.9125, 
945.9375, 945.9625, 945.9875, 946.0125, 946.0375, 946.0625, 946.0875, 
946.1125, 946.1375, 946.1625, 946.1875, 946.2125, 946.2375, 946.2625, 
946.2875, 946.3125, 946.3375, 946.3625, 946.3875, 946.4125, 946.4375, 
946.4625, 946.4875, 946.5125, 946.5375, 946.5625, 946.5875, 946.6125, 
946.6375, 946.6625, 946.6875, 946.7125, 946.7375, 946.7625, 946.7875, 
946.8125, 946.8375, 946.8625, 946.8875, 946.9125, 946.9375, 946.9625, 
946.9875, 947.0125, 947.0375, 947.0625, 947.0875, 947.1125, 947.1375, 
947.1625, 947.1875, 947.2125, 947.2375, 947.2625, 947.2875, 947.3125, 
947.3375, 947.3625, 947.3875, 947.4125, 947.4375, 947.4625, 947.4875, 
947.5125, 947.5375, 947.5625, 947.5875, 947.6125, 947.6375, 947.6625, 
947.6875, 947.7125, 947.7375, 947.7625, 947.7875, 947.8125, 947.8375, 
947.8625, 947.8875, 947.9125, 947.9375, 947.9625, 947.9875, 948.0125, 
948.0375, 948.0625, 948.0875, 948.1125, 948.1375, 948.1625, 948.1875, 
948.2125, 948.2375, 948.2625, 948.2875, 948.3125, 948.3375, 948.3625, 
948.3875, 948.4125, 948.4375, 948.4625, 948.4875, 948.5125, 948.5375, 
948.5625, 948.5875, 948.6125, 948.6375, 948.6625, 948.6875, 948.7125, 
948.7375, 948.7625, 948.7875, 948.8125, 948.8375, 948.8625, 948.8875, 
948.9125, 948.9375, 948.9625, 948.9875, 949.0125, 949.0375, 949.0625, 
949.0875, 949.1125, 949.1375, 949.1625, 949.1875, 949.2125, 949.2375, 
949.2625, 949.2875, 949.3125, 949.3375, 949.3625, 949.3875, 949.4125, 
949.4375, 949.4625, 949.4875, 949.5125, 949.5375, 949.5625, 949.5875, 
949.6125, 949.6375, 949.6625, 949.6875, 949.7125, 949.7375, 949.7625, 
949.7875, 949.8125, 949.8375, 949.8625, 949.8875, 949.9125, 949.9375, 
949.9625, 949.9875, 950.0125, 950.0375, 950.0625, 950.0875, 950.1125, 
950.1375, 950.1625, 950.1875, 950.2125, 950.2375, 950.2625, 950.2875, 
950.3125, 950.3375, 950.3625, 950.3875, 950.4125, 950.4375, 950.4625, 
950.4875, 950.5125, 950.5375, 950.5625, 950.5875, 950.6125, 950.6375, 
950.6625, 950.6875, 950.7125, 950.7375, 950.7625, 950.7875, 950.8125, 
950.8375, 950.8625, 950.8875, 950.9125, 950.9375, 950.9625, 950.9875, 
951.0125, 951.0375, 951.0625, 951.0875, 951.1125, 951.1375, 951.1625, 
951.1875, 951.2125, 951.2375, 951.2625, 951.2875, 951.3125, 951.3375, 
951.3625, 951.3875, 951.4125, 951.4375, 951.4625, 951.4875, 951.5125, 
951.5375, 951.5625, 951.5875, 951.6125, 951.6375, 951.6625, 951.6875, 
951.7125, 951.7375, 951.7625, 951.7875, 951.8125, 951.8375, 951.8625, 
951.8875, 951.9125, 951.9375, 951.9625, 951.9875.

    (1) A single broadcast station may be authorized up to a maximum of 
twenty segments (500 kHz total bandwidth) for transmission of program 
material between a single origin and one or more designations. The 
station may lease excess capacity for broadcast and other uses on a 
secondary basis, subject to availability of spectrum for broadcast use. 
However, an FM station licensed for twelve or fewer segments (300 kHz 
total bandwidth) or an AM station licensed for eight or fewer segments 
(200 kHz total bandwidth) may lease excess capacity for broadcast and 
other uses on a primary basis.
    (2) An applicant (new or modification of existing license) may 
assume the cost of replacement of one or more existing licensees 
equipment with narrowband equipment of comparable capabilities and 
quality in order to make available spectrum for its facilities. Existing 
licensees must accept such replacement without cost to them except upon 
a showing that the replacement equipment does not meet the capability or 
quality requirements.
    (c) The frequency bands 18,760-18,820 and 19,100-19,160 MHz are 
available for assignment to aural broadcast STL and intercity relay 
stations and are shared on a co-primary basis with other fixed services 
under Parts 21, 78 and 94 of the Commission's rules.
    (1) 5 MHz maximum authorized bandwidth channels:

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------------------------------------------------------------------------
                                                               Receive  
                  Transmit (receive) (MHz)                    (transmit)
                                                                (MHz)   
------------------------------------------------------------------------
                           340 MHz Separation                           
                                                                        
            
18762.5....................................................      19102.5
18767.5....................................................      19107.5
18772.5....................................................      19112.5
18777.5....................................................      19117.5
18782.5....................................................      19122.5
18787.5....................................................      19127.5
18792.5....................................................      19132.5
18797.5....................................................      19137.5
18802.5....................................................      19142.5
18807.5....................................................      19147.5
18812.5....................................................      19152.5
18817.5....................................................      19157.5
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Applicants may use either a two-way link or one frequency of a frequency 
pair for a one-way link and shall coordinate proposed operations 
pursuant to the procedures required in Sec. 21.100(d).
    (2) [Reserved]
    (d) [Reserved]
    (e) The use of the frequencies listed in paragraph (b) of this 
section by aural broadcast intercity relay stations is subject to the 
condition that no harmful interference is caused to other classes of 
stations operating in accordance with the Table of Frequency Allocations 
contained in Sec. 2.106 of this chapter.

[ 28 FR 13716 , Dec. 14, 1963, as amended at  48 FR 50332 , Nov. 1, 1983;  49 FR 37777 , Sept. 26, 1984;  50 FR 4658 , Feb. 1, 1985;  50 FR 7341 , Feb. 22, 
1985;  50 FR 34150 , Aug. 23, 1985;  50 FR 48600 , Nov. 26, 1985;  54 FR 10329 , Mar. 13, 1989;  54 FR 24905 , June 12, 1989;  54 FR 30043 , July 18, 
1989]