Sec.  27.50   Power and antenna height limits.

   

   (a) The following power limits apply to the 2305-2320 MHz and
   2345-2360 MHz bands:

   (1) Fixed, land, and radiolocation land stations transmitting are
   limited to 2000 watts peak equivalent isotropically radiated power
   (EIRP).

   (2) Mobile and radiolocation mobile stations transmitting are limited
   to 20 watts EIRP peak power.

   (b) The following power and antenna height limits apply to
   transmitters operating in the 746-764 MHz and 776-794 MHz bands:

   (1) Fixed and base stations transmitting in the 746-764 MHz band and
   the 777-792 MHz band must not exceed an effective radiated power (ERP)
   of 1000 watts and an antenna height of 305 m height above average
   terrain (HAAT), except that antenna heights greater than 305 m HAAT
   are permitted if power levels are reduced below 1000 watts ERP in
   accordance with Table 1 of this section;

   (2) Control stations and mobile stations transmitting in the 747-762
   MHz band and the 776-794 MHz band and fixed stations transmitting in
   the 776-777 MHz band and the 792-794 MHz band are limited to 30 watts
   ERP;

   (3) Portable stations (hand-held devices) transmitting in the 747-762
   MHz band and the 776-794 MHz band are limited to 3 watts ERP;

   (4) Maximum composite transmit power shall be measured over any
   interval of continuous transmission using instrumentation calibrated
   in terms of 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, etc., so as to obtain a true maximum
   composite measurement for the emission in question over the full
   bandwidth of the channel.

   (c) The following power and antenna height requirements apply to
   stations transmitting in the 698-746 MHz band:

   (1) Fixed and base stations are limited to a maximum effective
   radiated power (ERP) of 50 kW, with the limitation on antenna heights
   as follows:

   (i) Fixed and base stations with an ERP of 1000 watts or less must not
   exceed an antenna height of 305 m height above average terrain (HAAT)
   except when the power is reduced in accordance with Table 1 of this
   section;

   (ii) The antenna height for fixed and base stations with an ERP
   greater than 1000 watts but not exceeding 50 kW is limited only to the
   extent required to satisfy the requirements of Sec. 27.55(b).

   (2) Control and mobile stations are limited to 30 watts ERP.

   (3) Portable stations (hand-held devices) are limited to 3 watts ERP.

   (4) Maximum composite transmit power shall be measured over any
   interval of continuous transmission using instrumentation calibrated
   in terms of 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, etc., so as to obtain a true maximum
   composite measurement for the emission in question over the full
   bandwidth of the channel.

   (5) Licensees intending to operate a base or fixed station at a power
   level greater than 1 kW ERP must provide advanced notice of such
   operation to the Commission and to licensees authorized in their area
   of operation. Licensees that must be notified are all licensees
   authorized under this part to operate a base or fixed station on an
   adjacent spectrum block at a location within 75 km of the base or
   fixed station operating at a power level greater than 1 kW ERP.
   Notices must provide the location and operating parameters of the base
   or fixed station operating at a power level greater than 1 kW ERP,
   including the station's ERP, antenna coordinates, antenna height above
   ground, and vertical antenna pattern, and such notices must be
   provided at least 90 days prior to the commencement of station
   operation.

   (d) The following power and antenna height requirements apply to
   stations transmitting in the 1710-1755 MHz and 2110-2155 MHz bands:

   (1) The power of each fixed or base station transmitting in the
   2110-2155 MHz band and located in any county with population density
   of 100 or fewer persons per square mile, based upon the most recently
   available population statistics from the Bureau of the Census, is
   limited to a peak equivalent isotropically radiated power (EIRP) of
   3280 watts and a peak transmitter output power of 200 watts. The power
   of each fixed or base station transmitting in the 2110-2155 MHz band
   from any other location is limited to a peak EIRP of 1640 watts and a
   peak transmitter output power of 100 watts. A licensee operating a
   base or fixed station utilizing a power of more than 1640 watts EIRP
   must coordinate such operations in advance with all Government and
   non-Government satellite entities in the 2025-2110 MHz band.
   Operations above 1640 watts EIRP must also be coordinated in advance
   with the following licensees within 120 kilometers (75 miles) of the
   base or fixed station: all Multipoint Distribution Service (MDS)
   licensees authorized under Part 21 in the 2155-2160 MHz band and all
   AWS licensees in the 2110-2155 MHz band.

   (2) Fixed, mobile, and portable (hand-held) stations operating in the
   1710-1755 MHz band are limited to a peak EIRP of 1 watt. Fixed
   stations operating in this band are limited to a maximum antenna
   height of 10 meters above ground, and mobile and portable stations
   must employ a means for limiting power to the minimum necessary for
   successful communications.

   (e) The following power limits apply to the paired 1392-1395 MHz and
   1432-1435 MHz bands as well as the unpaired 1390-1392 MHz band (1.4
   GHz band):

   (1) Fixed stations transmitting in the 1390-1392 MHz and 1432-1435 MHz
   bands are limited to 2000 watts EIRP peak power. Fixed stations
   transmitting in the 1392-1395 MHz band are limited to 100 watts EIRP
   peak power.

   (2) Mobile stations transmitting in the 1390-1392 MHz and 1432-1435
   MHz bands are limited to 4 watts EIRP peak power. Mobile stations
   transmitting in the1392-1395 MHz band are limited to 1 watt EIRP peak
   power.

   (f) The following power limits apply to the 1670-1675 MHz band:

   (1) Fixed and base stations are limited to 2000 watts EIRP peak power.

   (2) Mobile stations are limited to 4 watts EIRP peak power.

   (g) [Reserved]

   (h) The following power limits shall apply in the BRS and EBS:

   (1) Main, booster and base stations.

   (i) The maximum EIRP of a main, booster or base station shall not
   exceed 33 dBW + 10log(X/Y) dBW, where X is the actual channel width in
   MHz and Y is either 6 MHz if prior to transition or the station is in
   the MBS following transition or 5.5 MHz if the station is in the LBS
   and UBS following transition, except as provided in paragraph
   (h)(1)(ii) of this section.

   (ii) If a main or booster station sectorizes or otherwise uses one or
   more transmitting antennas with a non-omnidirectional horizontal plane
   radiation pattern, the maximum EIRP in dBW in a given direction shall
   be determined by the following formula: EIRP = 33 dBW + 10 log(X/Y)
   dBW + 10 log(360/beamwidth) dBW, where X is the actual channel width
   in MHz, Y is either (i) 6 MHz if prior to transition or the station is
   in the MBS following transition or (ii) 5.5 MHz if the station is in
   the LBS and UBS following transition, and beamwidth is the total
   horizontal plane beamwidth of the individual transmitting antenna for
   the station or any sector measured at the half-power points.

   (2) Mobile and other user stations. Mobile stations are limited to 2.0
   watts EIRP. All user stations are limited to 2.0 watts transmitter
   output power.

   (3) For television transmission, the peak power of the accompanying
   aural signal must not exceed 10 percent of the peak visual power of
   the transmitter. The Commission may order a reduction in aural signal
   power to diminish the potential for harmful interference.

   (4) For main, booster and response stations utilizing digital
   emissions with non-uniform power spectral density (e.g. unfiltered
   QPSK), the power measured within any 100 kHz resolution bandwidth
   within the 6 MHz channel occupied by the non-uniform emission cannot
   exceed the power permitted within any 100 kHz resolution bandwidth
   within the 6 MHz channel if it were occupied by an emission with
   uniform power spectral density, i.e., if the maximum permissible power
   of a station utilizing a perfectly uniform power spectral density
   across a 6 MHz channel were 2000 watts EIRP, this would result in a
   maximum permissible power flux density for the station of 2000/60 =
   33.3 watts EIRP per 100 kHz bandwidth. If a non-uniform emission were
   substituted at the station, station power would still be limited to a
   maximum of 33.3 watts EIRP within any 100 kHz segment of the 6 MHz
   channel, irrespective of the fact that this would result in a total 6
   MHz channel power of less than 2000 watts EIRP."

   (i) Peak transmit power shall be measured over any interval of
   continuous transmission using instrumentation calibrated in terms of
   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, etc., so as to obtain a true peak measurement for
   the emission in question over the full bandwidth of the channel.

    Table 1_Permissible Power and Antenna Heights for Base and Fixed
            Stations in the 698-764 MHz and 777-792 MHz Bands
------------------------------------------------------------------------
                                                               Effective
                                                                radiated
            Antenna height (AAT) in meters (feet)                power
                                                                 (ERP)
                                                                (watts)
------------------------------------------------------------------------
Above 1372 (4500)............................................         65
Above 1220 (4000) To 1372 (4500).............................         70
Above 1067 (3500) To 1220 (4000).............................         75
Above 915 (3000) To 1067 (4000)..............................        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
------------------------------------------------------------------------

   [ 62 FR 16497 , Apr. 7, 1997, as amended at  65 FR 3147 , Jan. 20, 2000;
    65 FR 17602 , Apr. 4, 2000;  65 FR 42882 , July 12, 2000;  65 FR 57267 ,
   Sept. 21, 2000;  67 FR 5511 , Feb. 6, 2002;  67 FR 41855 , June 20, 2002;
    69 FR 5715 , Feb. 6, 2004;  69 FR 72033 , Dec. 10, 2004;  69 FR 75172 ,
   Dec. 15, 2004;  69 FR 77950 , Dec. 29, 2004;  70 FR 1190 , Jan. 6, 2005]