Sec.  90.645   Permissible operations.

   Conventional and trunked radio systems may be used:

   (a) Only for purposes expressly allowed under this part.

   (b) Only persons who are eligible for facilities, either under this subpart
   or in the radio service included under subparts B or C of this part.

   (c) Except for licensees classified as CMRS providers under part 20 of this
   chapter, only for the transmission of messages or signals permitted in the
   services is which the participants are eligible.

   (d) For digital or analog transmissions.

   (e) An SMRS licensee or a licensee who has been authorized a channel(s) on
   an exclusive basis, may use the system for the transmission of any
   base/mobile message, page or signal permitted in the service in which the
   participants are eligible.

   (f) Where the channel(s) is assigned to an SMRS licensee or exclusively to a
   single licensee, or where all users of a system agree, more than a single
   emission may be utilized within the authorized bandwidth. In such cases, the
   frequency stability requirements of  Sec. 90.213 shall not apply, but out-of-band
   emission limits of  Sec. 90.209 shall be met.

   (g) Up to five (5) contiguous 809–816/854–861 band channels as listed in
    Sec.  Sec. 90.615, 90.617, and 90.619 may be authorized after justification for
   systems requiring more than the normal single channel bandwidth. If
   necessary, licensees may trade channels amongst themselves in order to
   obtain contiguous frequencies. Notification of such proposed exchanges shall
   be made to the appropriate frequency coordinator(s) and to the Commission by
   filing an application for license modification.

   (h) Up to 10 contiguous 896–901/935–940 MHz band channels as listed in
    Sec. 90.617 may be combined for systems requiring more than the normal single
   channel bandwidth. If necessary, licensees may trade channels amongst
   themselves in order to obtain contiguous frequencies. Notification of such
   proposed exchanges shall be made to the appropriate frequency coordinator(s)
   and to the Commission by filing an application for license modification.

   (i) Paging operations may be utilized on multiple licensed facilities
   (community repeaters) only when all licensees of the facility agree to such
   use.

   [ 47 FR 41032 , Sept. 16, 1982, as amended at  48 FR 51929 , Nov. 15, 1983;  51 FR 37405 , Oct. 22, 1986;  59 FR 59966 , Nov. 21, 1994;  62 FR 18935 , Apr. 17,
   1997;  63 FR 68970 , Dec. 14, 1998;  69 FR 67849 , Nov. 22, 2004]