§  90.247   Mobile repeater stations.

   A mobile station authorized to operate on a mobile service frequency
   above 25 MHz may be used as a mobile repeater to extend the
   communications range of hand-carried units subject to the following:

   (a) Mobile repeaters and/or associated hand-carried transmitters may be
   assigned separate base/mobile frequencies for this use in addition to
   the number of frequencies normally assignable to the licensee.

   (b)-(c) [Reserved]

   (d) In the Industrial/Business Pool, on frequencies designated with an
   "LR" in the coordinator column of the frequency table in § 90.35(b)(3),
   use of mobile repeaters is on a secondary basis to the stations of any
   other licensee. Hand carried units used in connection with mobile
   repeaters on frequencies designated with an "LR" in the coordinator
   column of the frequency table in § 90.35(b)(3) may operate only above
   150 MHz and are limited to a maximum output power of six watts. The
   frequency and maximum power shall be specified in the station
   authorization.

   (e) In the Industrial/Business Pool, on frequencies designated with an
   "LR" in the coordinator column of the frequency table in § 90.35(b)(3),
   the output power of a mobile repeater station, when transmitting as a
   repeater station on the frequency used for communication with its
   associated pack-carried or hand-carried units, shall not exceed 6 watts
   except when the same frequency is also used by the same station for
   direct communication with vehicular mobile units or with one or more
   base stations.

   (f) When automatically retransmitting messages originated by or
   destined for hand-carried units, each mobile station shall activate the
   mobile transmitter only with a continuous access signal, the absence of
   which will de-activate the mobile transmitter. The continuous access
   signal is not required when the mobile unit is equipped with a switch
   that activates the automatic mode of the mobile unit and an automatic
   time-delay device that de-activates the transmitter after any
   uninterrupted transmission period in excess of 3 minutes. For the
   purposes of this rule section the continuous access signal can be
   achieved by use of digital or analog methods.

   [ 43 FR 54791 , Nov. 22, 1978, as amended at  62 FR 18928 , Apr. 17, 1997;
    75 FR 19284 , Apr. 14, 2019]