Sec. 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) In the Industrial/Business Pool, on frequencies below 450 MHz, 
only low power frequencies (2 watts or less output power) may be 
assigned for use by mobile repeaters or by hand-carried transmitters 
whose communications are directed to mobile repeaters, when separate 
frequencies are assigned for that purpose.
    (c) Except as provided in paragraph (d) of this section, hand-
carried transmitters whose communications will be automatically relayed 
by mobile stations shall be limited to a maximum output power of 2.5 
watts.
    (d) In the Industrial/Business Pool, on frequencies designated with 
an ``LR'' in the coordinator column of the frequency table in 
Sec. 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 Sec. 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 
Sec. 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 coded tone, the absence of 
which will de-activate the mobile transmitter. The continuous coded tone 
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.
[ 43 FR 54791 , Nov. 22, 1978, as amended at  62 FR 18928 , Apr. 17, 1997]

    Effective Date Note: At  62 FR 18928 , Apr. 17, 1997, Sec. 90.247 was 
amended by revising paragraphs (a), (b), (d), and (e), effective Oct. 
17, 1997.