§  90.637   Restrictions on operational fixed stations.

   (a) Except for control stations, operational fixed operations will not
   be authorized in the 806–824 MHz, 851–869 MHz, 896–901 MHz, or 935–940
   MHz bands. This does not preclude secondary fixed tone signaling and
   alarm operations authorized in § 90.235 or in paragraph (c) of this
   section.

   (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.

   (c) Trunked and conventional systems that have exclusive-use status in
   their respective geographic areas may conduct fixed ancillary signaling
   and data transmissions subject to the following requirements:

   (1) All operations must be on a secondary, non-interference basis to
   the primary mobile operation of any other licensee.

   (2) The output power at the remote site must not exceed 30 watts.

   (3) Any fixed transmitters will not count toward meeting the mobile
   loading requirements nor be considered in whole or in part as a
   justification for authorizing additional frequencies in the licensee's
   mobile system.

   (4) Automatic means must be provided to deactivate the remote
   transmitter in the event the carrier remains on for a period in excess
   of three minutes.

   (5) Operational fixed stations authorized pursuant to the provisions of
   paragraphs (c) and (d) of this section are exempt from the requirements
   of § § 90.425 and 90.429.

   (d) Conventional systems that do not have exclusive-use status in their
   respective geographic areas may conduct fixed ancillary signaling and
   data transmissions only in accordance with all the provisions of
   § 90.235.

   [ 47 FR 41032 , Sept. 16, 1982, as amended at  48 FR 51929 , Nov. 15, 1983;
    49 FR 36377 , Sept. 17, 1984;  51 FR 37405 , Oct. 22, 1986;  52 FR 1332 ,
   Jan. 13, 1987;  53 FR 12157 , Apr. 13, 1988;  57 FR 34693 , Aug. 6, 1992]