§ 90.537   Trunking requirement.

   (a) General use and State License channels. All systems using six or
   more narrowband channels in the 769-775 MHz and 799-805 MHz frequency
   bands must be trunked systems, except for those described in paragraph
   (b) of this section.

   (b) Interoperability and low power channels. Trunking is permitted only
   on Interoperability channels specified in § 90.531(b)(1)(iii). Trunked
   use must be strictly on a secondary, non-interference basis to
   conventional operations. The licensee must monitor and immediately
   release these channels when they are needed for interoperability
   purposes. All systems using narrowband low power channels listed in
   § 90.531(b)(3) and (4) are exempt from the trunking requirements
   described in paragraph (a) of this section.

   [ 79 FR 39340 , July 10, 2014]

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