Sec.  24.232   Power and antenna height limits.

   (a) Base stations are limited to 1640 watts peak equivalent isotropically
   radiated power (EIRP) with an antenna height up to 300 meters HAAT, except
   as described in paragraph (b) below. See  Sec. 24.53 for HAAT calculation method.
   Base station antenna heights may exceed 300 meters with a corresponding
   reduction in power; see Table 1 of this section. The service area boundary
   limit and microwave protection criteria specified in  Sec.  Sec. 24.236 and 24.237
   apply.

 Table 1_Reduced Power for Base Station Antenna Heights Over 300 Meters
------------------------------------------------------------------------
                                                               Maximum
                       HAAT in meters                         EIRP watts
------------------------------------------------------------------------
[le] 300...................................................         1640
[le] 500...................................................         1070
[le] 1000..................................................          490
[le] 1500..................................................          270
[le] 2000..................................................          160
------------------------------------------------------------------------

   (b) 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, are limited to 3280
   watts peak equivalent isotropically radiated power (EIRP) with an antenna
   height up to 300 meters HAAT; See  Sec. 24.53 for HAAT calculation method. Base
   station antenna heights may exceed 300 meters with a corresponding reduction
   in power; see Table 2 of this section. The service area boundary limit and
   microwave protection criteria specified in  Sec.  Sec. 24.236 and 24.237 apply.
   Operation under this paragraph must be coordinated in advance with all PCS
   licensees 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 2_Reduced Power for Base Station Antenna Heights Over 300 Meters
------------------------------------------------------------------------
                                                               Maximum
                       HAAT in meters                         EIRP watts
------------------------------------------------------------------------
[le] 300...................................................         3280
[le] 500...................................................         2140
[le] 1000..................................................          980
[le] 1500..................................................          540
[le] 2000..................................................          320
------------------------------------------------------------------------

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

   (d) 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.

   [ 70 FR 61059 , Oct. 20, 2005]