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§ 90.627 Limitation on the number of frequency pairs that may be assignable for trunked systems and on the number of trunked systems.
(a) The maximum number of frequency pairs that may be assigned at any one time for the operation of a trunked radio system is twenty, except as specified in § 90.621(a)(1)(iv).
(b) No non-SMR licensee will be authorized an additional trunked system within 64 kilometers (40 miles) of an existing trunked system, except where:
(1) The additional trunked system will be used to provide radio facilities for a single entity, where the additional system is justified on the basis of the requirements of the proposed single user; or,
(2) The licensee's existing trunked system is loaded to at least 70 mobile and control stations per channel.