§ 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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