§  90.281   Restrictions on operational fixed stations in the 421–430 MHz
band.

   (a) Except for control stations, operational fixed facilities will not
   be authorized in the 421–430 MHz band. This does not preclude secondary
   fixed tone signaling and alarm operations authorized in § 90.235.

   (b) Control stations associated with one or more mobile relay stations
   will be authorized only on the assigned frequency of the associated
   mobile station. Use of a mobile service frequency by a control station
   of a mobile relay system is subject to the condition that harmful
   interference shall not be caused to stations of licensees authorized to
   use the frequency for mobile service communications.

   [ 52 FR 6158 , Mar. 2, 1987, as amended at  54 FR 38681 , Sept. 20, 1989]