§  27.1507   Effective radiated power limits for 900 MHz broadband systems.

   (a) Maximum ERP. The power limits specified in this section are
   applicable to operations in areas more than 110 km (68.4 miles) from
   the U.S./Mexico border and 140 km (87 miles) from the U.S./Canada
   border.

   (1) General limit. (i) The ERP for base and repeater stations must not
   exceed 400 watts/megahertz power spectral density (PSD) per sector and
   an antenna height of 304 m height above average terrain (HAAT), except
   that antenna heights greater than 304 m HAAT are permitted if power
   levels are reduced below 400 watts/megahertz ERP in accordance with
   Table 1 of this section.

   (ii) Provided that they also comply with paragraphs (b) and (c) of this
   section, licensees are permitted to operate base and repeater stations
   with up to a maximum ERP of 1000 watts/megahertz power spectral density
   (PSD) per sector and an antenna height of 304 m height above average
   terrain (HAAT), except that antenna heights greater than 304 m HAAT are
   permitted if power levels are reduced below 1000 watts/megahertz ERP in
   accordance with Table 2 of this section.

   (2) Rural areas. For systems that are located in counties with
   population densities of 100 persons or fewer per square mile, based
   upon the most recently available population statistics from the Bureau
   of the Census:

   (i) The ERP for base and repeater stations must not exceed 800
   watts/megahertz power spectral density (PSD) per sector and an antenna
   height of 304 m height above average terrain (HAAT), except that
   antenna heights greater than 304 m HAAT are permitted if power levels
   are reduced below 800 watts/megahertz ERP in accordance with Table 3 of
   this section.

   (ii) Provided that they also comply with paragraphs (b) and (c) of this
   section, base and repeater stations may operate with up to a maximum
   ERP of 2000 watts/megahertz power spectral density (PSD) per sector and
   an antenna height of 304 m height above average terrain (HAAT), except
   that antenna heights greater than 304 m HAAT are permitted if power
   levels are reduced below 2000 watts/megahertz ERP in accordance with
   Table 4 of this section.

   (3) Mobile, control and auxiliary test stations. Mobile, control and
   auxiliary test stations must not exceed 10 watts ERP.

   (4) Portable stations. Portable stations must not exceed 3 watts ERP.

   (b) Power flux density (PFD). Each 900 MHz broadband base or repeater
   station that exceeds the ERP limit of paragraph (a)(1)(i) or (a)(2)(i)
   of this section must be designed and deployed so as not to exceed a
   modeled PFD of 3000 microwatts/m2/MHz over at least 98% of the area
   within 1 km of the base or repeater station antenna, at 1.6 meters
   above ground level. To ensure compliance with this requirement, the
   licensee must perform predictive modeling of the PFD values within at
   least 1 km of each base or repeater station antenna prior to commencing
   such operations and, thereafter, prior to making any site modifications
   that may increase the PFD levels around the base or repeater station.
   The modeling must take into consideration terrain and other local
   conditions and must use good engineering practices for the 900 MHz
   band.

   (c) Power measurement. Measurement of 900 MHz broadband base
   transmitter and repeater ERP must be made using an average power
   measurement technique. Power measurements for base transmitters and
   repeaters must be made in accordance with either of the following:

   (1) A Commission-approved average power technique (see FCC Laboratory's
   Knowledge Database); or

   (2) For purposes of this section, peak transmit power must be measured
   over an interval of continuous transmission using instrumentation
   calibrated in terms of an rms-equivalent voltage. The measurement
   results shall be properly adjusted for any instrument limitations, such
   as detector response times, limited resolution bandwidth capability
   when compared to the emission bandwidth, sensitivity, etc., so as to
   obtain a true peak measurement for the emission in question over the
   full bandwidth of the channel.

   (d) PAR limit. The peak-to-average ratio (PAR) of the transmission must
   not exceed 13 dB.

   (e) Height-power limit. As specified in paragraph (a) of this section,
   the following tables specify the maximum base station power for antenna
   heights above average terrain (HAAT) that exceed 304 meters.

   Table 1 to § 27.1507—Permissible Power and Antenna Heights for Base
   Stations and Repeaters Permitted To Transmit With Up to 400
   Watts/Megahertz
   Antenna height (AAT)
   in meters
   (feet) Effective radiated
   power (ERP)
   (watts/megahertz)
          Above 1372 (4500)                 26
          Above 1220 (4000) To 1372 (4500)  28
          Above 1067 (3500) To 1220 (4000)  30
          Above 915 (3000) To 1067 (3500)   40
          Above 763 (2500) To 915 (3000)    56
          Above 610 (2000) To 763 (2500)    80
          Above 458 (1500) To 610 (2000)   140
          Above 305 (1000) To 458 (1500)   240
          Up to 305 (1000)                 400

   Table 2 to § 27.1507—Permissible Power and Antenna Heights for Base
   Stations and Repeaters Permitted To Transmit With Up to 1000
   Watts/Megahertz
   Antenna height (AAT)
   in meters
   (feet) Effective radiated
   power (ERP)
   (watts/megahertz)
          Above 1372 (4500)                  65
          Above 1220 (4000) To 1372 (4500)   70
          Above 1067 (3500) To 1220 (4000)   75
          Above 915 (3000) To 1067 (3500)   100
          Above 763 (2500) To 915 (3000)    140
          Above 610 (2000) To 763 (2500)    200
          Above 458 (1500) To 610 (2000)    350
          Above 305 (1000) To 458 (1500)    600
          Up to 305 (1000)                 1000

   Table 3 to § 27.1507—Permissible Power and Antenna Heights for Base
   Stations and Repeaters Permitted To Transmit With Up to 800
   Watts/Megahertz
   Antenna height (AAT)
   in meters
   (feet) Effective radiated
   power (ERP)
   (watts/megahertz)
          Above 1372 (4500)                 52
          Above 1220 (4000) To 1372 (4500)  56
          Above 1067 (3500) To 1220 (4000)  60
          Above 915 (3000) To 1067 (3500)   80
          Above 763 (2500) To 915 (3000)   112
          Above 610 (2000) To 763 (2500)   160
          Above 458 (1500) To 610 (2000)   280
          Above 305 (1000) To 458 (1500)   480
          Up to 305 (1000)                 800

   Table 4 to § 27.1507—Permissible Power and Antenna Heights for Base
   Stations and Repeaters Permitted To Transmit With Up to 2000
   Watts/Megahertz
   Antenna height (AAT)
   in meters
   (feet) Effective radiated
   power (ERP)
   (watts/megahertz)
          Above 1372 (4500)                 130
          Above 1220 (4000) To 1372 (4500)  140
          Above 1067 (3500) To 1220 (4000)  150
          Above 915 (3000) To 1067 (3500)   200
          Above 763 (2500) To 915 (3000)    280
          Above 610 (2000) To 763 (2500)    400
          Above 458 (1500) To 610 (2000)    700
          Above 305 (1000) To 458 (1500)   1200
          Up to 305 (1000)                 2000