Sec.  27.50   Power and antenna height limits.

   Link to an amendment published at  73 FR 24184 , May 2, 2008.

   (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 746–763 MHz, 775–793 MHz and 805–806 MHz bands:

   (1) Fixed and base stations transmitting a signal in the 757–758 and 775–776
   MHz bands 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)  Fixed and base stations transmitting a signal in the 746–757 MHz,
   758–763 MHz, 776–787 MHz, and 788–793 MHz bands with an emission bandwidth
   of 1 MHz or less must not exceed an ERP of 1000 watts and an antenna height
   of 305 m 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.

   (3) Fixed and base stations located in a 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, and transmitting a
   signal in the 746–757 MHz, 758–763 MHz, 776–787 MHz, and 788–793 MHz bands
   with an emission bandwidth of 1 MHz or less must not exceed an ERP of 2000
   watts and an antenna height of 305 m HAAT, except that antenna heights
   greater than 305 m HAAT are permitted if power levels are reduced below 2000
   watts ERP in accordance with Table 2 of this section.

   (4)  Fixed and base stations transmitting a signal in the 746–757 MHz,
   758–763 MHz, 776–787 MHz, and 788–793 MHz bands with an emission bandwidth
   greater than 1 MHz must not exceed an ERP of 1000 watts/MHz and an antenna
   height of 305 m HAAT, except that antenna heights greater than 305 m HAAT
   are  permitted  if  power  levels are reduced below 1000 watts/MHz ERP
   accordance with Table 3 of this section.

   (5) Fixed and base stations located in a 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, and transmitting a
   signal in the 746–757 MHz, 758–763 MHz, 776–787 MHz, and 788–793 MHz bands
   with an emission bandwidth greater than 1 MHz must not exceed an ERP of 2000
   watts/MHz and an antenna height of 305 m HAAT, except that antenna heights
   greater than 305 m HAAT are permitted if power levels are reduced below 2000
   watts/MHz ERP in accordance with Table 4 of this section.

   (6) Licensees of fixed or base stations transmitting a signal in the 746–757
   MHz, 758–763 MHz, 776–787 MHz, and 788–793 MHz bands at an ERP greater than
   1000 watts must comply with the provisions set forth in paragraph (b)(8) of
   this section and  Sec. 27.55(c).

   (7) Licensees seeking to operate a fixed or base station located in a 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, and transmitting a signal in the 746–757 MHz, 758–763 MHz, 776–787
   MHz, and 788–793 MHz bands at an ERP greater than 1000 watts must:

   (i) coordinate in advance with all licensees authorized to operate in the
   698–763 MHz, 775–793, and 805–806 MHz bands within 120 kilometers (75 miles)
   of the base or fixed station;

   (ii)  coordinate  in advance with all regional planning committees, as
   identified  in   Sec. 90.527  of this chapter, with jurisdiction within 120
   kilometers (75 miles) of the base or fixed station.

   (8)  Licensees authorized to transmit in the 746–757 MHz, 758–763 MHz,
   776–787 MHz, and 788–793 MHz bands and intending to operate a base or fixed
   station at a power level permitted under the provisions of paragraph (b)(6)
   of  this section must provide advanced notice of such operation to the
   Commission and to licensees authorized in their area of operation. Licensees
   who must be notified are all licensees authorized to operate in the 763–775
   MHz and 793–805 MHz bands under part 90 of this chapter within 75 km of the
   base or fixed station and all regional planning committees, as identified in
    Sec. 90.527 of this chapter, with jurisdiction within 75 km of the base or fixed
   station. Notifications must provide the location and operating parameters of
   the base or fixed station, including the station's ERP, antenna coordinates,
   antenna  height  above  ground, and vertical antenna pattern, and such
   notifications must be provided at least 90 days prior to the commencement of
   station operation.

   (9) Control stations and mobile stations transmitting in the 746–757 MHz,
   758–763  MHz,  776–793  MHz,  and 805–806 MHz bands and fixed stations
   transmitting in the 787–788 MHz and 805–806 MHz bands are limited to 30
   watts ERP.

   (10) Portable stations (hand-held devices) transmitting in the 746–757 MHz,
   758–763 MHz, 776–793 MHz, and 805–806 MHz bands are limited to 3 watts ERP.

   (11) For transmissions in the 757–758, 775–776, 787–788, and 805–806 MHz
   bands, 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.

   (12) For transmissions in the 746–757, 758–763, 776–787, and 788–793 MHz
   bands, licensees may employ equipment operating in compliance with either
   the measurement techniques described in paragraph (b)(11) of this section or
   a Commission-approved average power technique. In both instances, equipment
   employed must be authorized in accordance with the provisions of  Sec. 27.51.

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

   (1) Fixed and base stations transmitting a signal with an emission bandwidth
   of 1 MHz or less 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) Fixed and base stations located in a 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, and transmitting a
   signal with an emission bandwidth of 1 MHz or less must not exceed an ERP of
   2000 watts and an antenna height of 305 m HAAT, except that antenna heights
   greater than 305 m HAAT are permitted if power levels are reduced below 2000
   watts ERP in accordance with Table 2 of this section;

   (3) Fixed and base stations transmitting a signal with an emission bandwidth
   greater than 1 MHz must not exceed an ERP of 1000 watts/MHz and an antenna
   height of 305 m HAAT, except that antenna heights greater than 305 m HAAT
   are  permitted if power levels are reduced below 1000 watts/MHz ERP in
   accordance with Table 3 of this section;

   (4) Fixed and base stations located in a 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, and transmitting a
   signal with an emission bandwidth greater than 1 MHz must not exceed an ERP
   of 2000 watts/MHz and an antenna height of 305 m HAAT, except that antenna
   heights greater than 305 m HAAT are permitted if power levels are reduced
   below 2000 watts/MHz ERP in accordance with Table 4 of this section;

   (5) Licensees seeking to operate a fixed or base station located in a 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, and transmitting a signal at an ERP greater than 1000 watts must:

   (i) coordinate in advance with all licensees authorized to operate in the
   698–763 MHz, 775–793, and 805–806 MHz bands within 120 kilometers (75 miles)
   of the base or fixed station;

   (ii)  coordinate  in advance with all regional planning committees, as
   identified  in   Sec.  Sec. 90.527 of this chapter, with jurisdiction within 120
   kilometers (75 miles) of the base or fixed station.

   (6) Licensees of fixed or base stations transmitting a signal at an ERP
   greater than 1000 watts and greater than 1000 watts/MHz must comply with the
   provisions of paragraph (c)(8) of this section and  Sec. 27.55(b), except that
   licensees of fixed or base stations located in a 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, must
   comply with the provisions of paragraph (c)(8) of this section and  Sec. 27.55(b)
   only if transmitting a signal at an ERP greater than 2000 watts and greater
   than 2000 watts/MHz;

   (7) A licensee authorized to operate in the 710–716, 716–722, or 740–746 MHz
   bands, or in any unpaired spectrum blocks within the 698–746 MHz band, may
   operate a fixed or base station at an ERP up to a total of 50 kW within its
   authorized,  6  MHz  spectrum  block if the licensee complies with the
   provisions of  Sec. 27.55(b). The antenna height for such stations is limited
   only to the extent required to satisfy the requirements of  Sec. 27.55(b).

   (8) Licensees intending to operate a base or fixed station at a power level
   permitted under the provisions of paragraph (c)(6) of this section must
   provide advanced notice of such operation to the Commission and to licensees
   authorized in their area of operation. Licensees who must be notified are
   all licensees authorized under this part to operate on an adjacent spectrum
   block within 75 km of the base or fixed station. Notifications must provide
   the  location  and  operating parameters of the base or fixed station,
   including the station's ERP, antenna coordinates, antenna height above
   ground,  and  vertical antenna pattern, and such notifications must be
   provided at least 90 days prior to the commencement of station operation.

   (9) Control and mobile stations are limited to 30 watts ERP;

   (10) Portable stations (hand-held devices) are limited to 3 watts ERP; and

   (11) Licensees may employ equipment operating in compliance with either the
   measurement techniques described in paragraph (b)(11) of this section or a
   Commission-approved average power technique. In both instances, equipment
   employed must be authorized in accordance with the provisions of  Sec. 27.51.

   (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. 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. 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 Broadband Radio
   Service (BRS) licensees authorized under part 27 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 to  Sec. 27.50.—Permissible Power and Antenna Heights for Base and Fixed
   Stations  in  the 757–758 and 775–776 MHz Bands and for Base and Fixed
   Stations in the 698–757 MHz, 758–763 MHz, 776–787 MHz and 788–793 MHz Bands
   Transmitting a Signal With an Emission Bandwidth of 1 MHz or Less
   Antenna height (AAT) in
   meters
   (feet) Effective radiated 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 (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 2 to  Sec. 27.50.—Permissible Power and Antenna Heights for Base and Fixed
   Stations in the 698–757 MHz, 758–763 MHz, 776–787 MHz and 788–793 MHz Bands
   Transmitting a Signal With an Emission Bandwidth of 1 MHz or Less
   Antenna height (AAT) in
   meters
   (feet) Effective radiated power (ERP)
   (watts)
          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

   Table 3 to  Sec. 27.50.—Permissible Power and Antenna Heights for Base and Fixed
   Stations in the 698–757 MHz, 758–763 MHz, 776–787 MHz and 788–793 MHz Bands
   Transmitting a Signal With an Emission Bandwidth Greater than 1 MHz
   Antenna height (AAT) in
   meters
   (feet) Effective radiated power (ERP) per MHz
   (watts/MHz)
          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 4 to  Sec. 27.50.—Permissible Power and Antenna Heights for Base and Fixed
   Stations in the 698–757 MHz, 758–763 MHz, 776–787 MHz and 788–793 MHz Bands
   Transmitting a Signal With an Emission Bandwidth Greater than 1 MHz
   Antenna height (AAT) in
   meters
   (feet) Effective radiated power (ERP) per MHz
   (watts/MHz )
          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

   [ 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;  70 FR 58065 , Oct. 5, 2005;
    72 FR 27709 , May 16, 2007;  72 FR 48849 , Aug. 24, 2007;  72 FR 67580 , Nov. 29,
   2007]

   Effective Date Notes:   1. At  72 FR 27709 , May 16, 2007,  Sec. 27.50 was amended,
   in part, by revising paragraph (c). Paragraphs (c) (5) and (8) contain
   information collection and recordkeeping requirements and will not become
   effective until approval has been given by the Office of Management and
   Budget.

   2. At  72 FR 48849 , Aug. 24, 2007,  Sec. 27.50 was amended by revising (b) through
   (12), (c)(5), (7), (8), (11) and tables 1 through 4. At  72 FR 67580 , Nov.
   29, 2007  Sec. 27.50 was corrected. This text contains information collection and
   recordkeeping requirements and will not become effective until approval has
   been given by the Office of Management and Budget.