§  90.537   Trunking requirement.

   (a) General use 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 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.

   [ 66 FR 10636 , Feb. 16, 2001, as amended at  72 FR 48861 , Aug. 24, 2007]

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