Sec.  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  Sec. 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]