§  90.249   Control stations.

   Control stations associated with land mobile stations under this part
   shall be authorized to operate subject to the following:

   (a) Frequencies for control stations. (1) Control stations may be
   authorized to operate on frequencies available for use by operational
   fixed stations.

   (2) A control station associated with mobile relay station(s) may, at
   the option of the applicant, be assigned the frequency of the
   associated mobile station. In the Industrial/Business Pool, on
   frequencies designated with an "LR" in the coordinator column of the
   frequency table in § 90.35(b)(3), such a control station may be
   assigned any mobile service station frequency available for assignment
   to mobile stations. Such operation is on a secondary basis to use of
   the frequency for regular mobile service communications.

   (3) Control and fixed stations in the Public Safety Pool may be
   authorized on a temporary basis to operate on frequencies available for
   base and mobile stations between 152 and 450 MHz, where there is an
   adequate showing that such operations cannot be conducted on
   frequencies allocated for assignment to operational fixed stations.
   Such operation will not be authorized initially or renewed for periods
   in excess of one year. Any such authorization shall be subject to
   immediate termination if harmful interference is caused to stations in
   the mobile service, or if the particular frequency is required for
   mobile service operations in the area concerned.

   (b) [Reserved]

   (c) A base station which is used intermittently as a control station
   for one or more associated mobile relay stations of the same licensee
   shall operate only on the mobile service frequency assigned to the
   associated mobile relay station when operating as a base station and on
   the mobile service frequency assigned to the associated mobile station
   when operating as a control station. Authority for such dual
   classification and use must be shown on the station authorization. When
   operating as a control station, the licensee must meet all control
   station requirements. In the Industrial/Business Pool, on frequencies
   designated with an "LR" in the coordinator column of the frequency
   table in § 90.35(b)(3), base stations used intermittently as control
   stations shall operate only on a mobile service frequency which is
   available for assignment to base stations.

   [ 43 FR 54791 , Nov. 22, 1978, as amended at  49 FR 36376 , Sept. 17, 1984;
    62 FR 18928 , Apr. 17, 1997]