Sec.  90.219   Use of signal boosters.

   Licensees authorized to operate radio systems in the frequency bands above
   150 MHz may employ signal boosters at fixed locations in accordance with the
   following criteria:

   (a) The amplified signal is retransmitted only on the exact frequency(ies)
   of the originating base, fixed, mobile, or portable station(s). The booster
   will fill in only weak signal areas and cannot extend the system's normal
   signal coverage area.

   (b) Class A narrowband signal boosters must be equipped with automatic gain
   control circuitry which will limit the total effective radiated power (ERP)
   of the unit to a maximum of 5 watts under all conditions. Class B broadband
   signal boosters are limited to 5 watts ERP for each authorized frequency
   that the booster is designed to amplify.

   (c) Class A narrowband boosters must meet the out-of-band emission limits of
    Sec. 90.210 for each narrowband channel that the booster is designed to amplify.
   Class B broadband signal boosters must meet the emission limits of  Sec. 90.210
   for frequencies outside of the booster's designed passband.

   (d) Class B broadband signal boosters are permitted to be used only in
   confined or indoor areas such as buildings, tunnels, underground areas,
   etc., or in remote areas, i.e., areas where there is little or no risk of
   interference to other users.

   (e) The licensee is given authority to operate signal boosters without
   separate authorization from the Commission. Certificated equipment must be
   employed and the licensee must ensure that all applicable rule requirements
   are met.

   (f) Licensees employing either Class A narrowband or Class B broadband
   signal boosters as defined in  Sec. 90.7 are responsible for correcting any
   harmful interference that the equipment may cause to other systems. Normal
   co-channel transmissions will not be considered as harmful interference.
   Licensees will be required to resolve interference problems pursuant to
    Sec. 90.173(b).

   [ 61 FR 31052 , June 19, 1996, as amended at  63 FR 36610 , July 7, 1998;  72 FR 35195 , June 27, 2007]

Subpart J—Non-Voice and Other Specialized Operations