Telecommunication. Part90:Private land mobile radio services. Subpart R:Regulations governing the licensing and use of frequencies in the 758–775 and 788–805 MHz bands. Section90.537: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.