§  24.232   Power and antenna height limits.

   (a)(1) Base stations with an emission bandwidth of 1 MHz or less are
   limited to 1640 watts equivalent isotropically radiated power (EIRP)
   with an antenna height up to 300 meters HAAT, except as described in
   paragraph (b) below.

   (2) Base stations with an emission bandwidth greater than 1 MHz are
   limited to 1640 watts/MHz equivalent isotropically radiated power
   (EIRP) with an antenna height up to 300 meters HAAT, except as
   described in paragraph (b) below.

   (3) Base station antenna heights may exceed 300 meters HAAT with a
   corresponding reduction in power; see Tables 1 and 2 of this section.

   (4) The service area boundary limit and microwave protection criteria
   specified in § § 24.236 and 24.237 apply.

   Table 1--Reduced Power for Base Station Antenna Heights Over 300
   Meters, With Emission Bandwidth of 1 MHz or Less
   HAAT in meters Maximum EIRP watts
   <=300                        1640
   <=500                        1070
   <=1000                        490
   <=1500                        270
   <=2000                        160

   Table 2--Reduced Power for Base Station Antenna Heights Over 300
   Meters, With Emission Bandwidth Greater Than 1 MHz
   HAAT in meters Maximum EIRP
   watts/MHz
   <=300 1640
   <=500 1070
   <=1000 490
   <=1500 270
   <=2000 160

   (b)(1) Base stations 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,
   with an emission bandwidth of 1 MHz or less are limited to 3280 watts
   equivalent isotropically radiated power (EIRP) with an antenna height
   up to 300 meters HAAT.

   (2) Base stations 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,
   with an emission bandwidth greater than 1 MHz are limited to 3280
   watts/MHz equivalent isotropically radiated power (EIRP) with an
   antenna height up to 300 meters HAAT.

   (3) Base station antenna heights may exceed 300 meters HAAT with a
   corresponding reduction in power; see Tables 3 and 4 of this section.

   (4) The service area boundary limit and microwave protection criteria
   specified in § § 24.236 and 24.237 apply.

   (5) Operation under this paragraph (b) at power limits greater than
   permitted under paragraph (a) of this section must be coordinated in
   advance with all broadband PCS licensees authorized to operate on
   adjacent frequency blocks within 120 kilometers (75 miles) of the base
   station and is limited to base stations located more than 120
   kilometers (75 miles) from the Canadian border and more than 75
   kilometers (45 miles) from the Mexican border.

   Table 3--Reduced Power for Base Station Antenna Heights Over 300
   Meters, With Emission Bandwidth of 1 MHz or Less
   HAAT in meters Maximum EIRP watts
   <=300                        3280
   <=500                        2140
   <=1000                        980
   <=1500                        540
   <=2000                        320

   Table 4--Reduced Power for Base Station Antenna Heights Over 300
   Meters, With Emission Bandwidth Greater Than 1 MHz
   HAAT in meters Maximum EIRP
   watts/MHz
   <=300 3280
   <=500 2140
   <=1000 980
   <=1500 540
   <=2000 320

   (c) Mobile and portable stations are limited to 2 watts EIRP and the
   equipment must employ a means for limiting power to the minimum
   necessary for successful communications.

   (d) Power measurements for transmissions by stations authorized under
   this section may be made either in accordance with a
   Commission-approved average power technique or in compliance with
   paragraph (e) of this section. In both instances, equipment employed
   must be authorized in accordance with the provisions of § 24.51. In
   measuring transmissions in this band using an average power technique,
   the peak-to-average ratio (PAR) of the transmission may not exceed 13
   dB.

   (e) Peak transmit power must be measured over any 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.

   Note to § 24.232: Height above average terrain (HAAT) is to be
   calculated using the method set forth in § 24.53 of this part.

   [ 73 FR 24183 , May 2, 2008]