§  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]