Sec. 90.187  Trunking in the bands between 150 and 512 MHz.

    (a) Applicants for trunked systems operating on frequencies between 
150 and 512 MHz (except 220-222 MHz) must indicate on their applications 
(class of station code, see Sec. 1.952 of this chapter or Instructions 
for FCC Form 600) that their system will be trunked. Licensees of 
stations that are not trunked, may trunk their systems only after 
modifying their license (See Sec. 90.135).
    (b) In the bands between 150 and 512 MHz, trunking may be authorized 
under the following conditions:
    (1) Where applicants for or licensees operating in the 470-512 MHz 
band meet the loading requirements of Sec. 90.313 and have exclusive use 
of their frequencies in their service area.
    (2) Trunking will be permitted on frequencies where an applicant or 
licensee does not have an exclusive service area, provided that all 
frequency coordination requirements are complied with and consent is 
obtained from all licensees pursuant to paragraphs (b)(2)(i), 
(b)(2)(ii), and (b)(2)(iii) of this section.
    (i) Stations that have operating frequencies (base and mobile) that 
are 15

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kHz or less removed from proposed stations that will operate with a 25 
kHz channel bandwidth; stations that have operating frequencies (base 
and mobile) that are 7.5 kHz or less removed from proposed stations that 
will operate with a 12.5 kHz bandwidth; or stations that have operating 
frequencies (base and mobile) 3.75 kHz or less removed from proposed 
stations that will operate with a 6.25 kHz bandwidth; and
    (ii) Stations with service areas (37 dBu contour for stations in the 
150-174 MHz band and 39 dBu contour for stations in the 421-512 MHz 
bands; See Sec. 90.205) that overlap a circle with radius 113 km (70 
mi.) from the proposed base station. Alternatively, applicants may 
submit an engineering analysis based upon generally accepted engineering 
practices and standards which demonstrates that the service area of the 
trunked system does not overlap any existing stations whose service 
areas overlap a circle with radius 113 km (70 mi.) from the proposed 
base station.
    (iii) The consensual agreements among licensees must specifically 
state the terms agreed upon and a statement must be submitted to the 
Commission indicating that all licensees have consented to the use of 
trunking. If a licensee has agreed to the use of trunking, but later 
decides against the use of trunking, the licensee may request that the 
licensee(s) of the trunked system reconsider the use of trunking. If the 
licensee is unable to reach an agreement with the licensee(s) of the 
trunked system, the licensee may request that the Commission consider 
the matter and assign it another channel. New licensees will only be 
assigned the same channel as a trunked system, if the new licensee 
reaches an agreement with the licensee(s) of the trunked system.
    (c) Trunking of systems licensed on paging-only channels or licensed 
in the Radiolocation Service (subpart F) is not permitted.
[ 62 FR 18926 , Apr. 17, 1997]

    Effective Date Note: At  62 FR 18926 , Apr. 17, 1997, Sec. 90.187 was 
added, effective Oct. 17, 1997.

                 Subpart I--General Technical Standards