Goto Section: 27.27 | 27.51 | Table of Contents
FCC 27.50
Revised as of October 1, 2010
Goto Year:2009 |
2011
§ 27.50 Power limits and duty cycle.
(a) The following power limits and related requirements apply to
stations transmitting in the 2305-2320 MHz band or the 2345-2360 MHz
band.
(1) Base and fixed stations. (i) For base and fixed stations
transmitting in the 2305-2315 MHz band or the 2350-2360 MHz band:
(A) The average equivalent isotropically radiated power (EIRP) must not
exceed 2,000 watts within any 5 megahertz of authorized bandwidth and
must not exceed 400 watts within any 1 megahertz of authorized
bandwidth.
(B) The peak-to-average power ratio (PAPR) of the transmitter output
power must not exceed 13 dB. The PAPR measurements should be made using
either an instrument with complementary cumulative distribution
function (CCDF) capabilities to determine that PAPR will not exceed 13
dB for more than 0.1 percent of the time or other Commission approved
procedure. The measurement must be performed using a signal
corresponding to the highest PAPR expected during periods of continuous
transmission.
(ii) For base and fixed stations transmitting in the 2315-2320 MHz band
or the 2345-2350 MHz band, the peak EIRP must not exceed 2,000 watts.
(iii) Base stations supporting frequency division duplex (FDD) mobile
and portable operations are restricted to transmitting in the 2345-2360
MHz bands.
(2) Fixed customer premises equipment stations. For fixed customer
premises equipment (CPE) stations transmitting in the 2305-2320 MHz
band or in the 2345-2360 MHz band, the peak EIRP must not exceed 20
watts within any 5 megahertz of authorized bandwidth. Fixed CPE
stations transmitting in the 2305-2320 MHz band or in the 2345-2360 MHz
band must employ automatic transmit power control when operating so the
stations operate with the minimum power necessary for successful
communications. The use of outdoor antennas for CPE stations or outdoor
CPE station installations operating with 2 watts per 5 megahertz or
less average EIRP is prohibited. For WCS CPE using TDD technology, the
duty cycle must not exceed 38 percent; for WCS CPE using FDD
technology, the duty cycle must not exceed 12.5 percent in the
2315-2320 MHz band, and must not exceed 25 percent in the 2305-2315 MHz
band.
(3) Mobile and portable stations. (i) For mobile and portable stations
transmitting in the 2305-2317.5 MHz band or the 2347.5-2360 MHz band,
the average EIRP must not exceed 250 milliwatts within any 5 megahertz
of authorized bandwidth and must not exceed 50 milliwatts within any 1
megahertz of authorized bandwidth. For mobile and portable stations
using time division duplex (TDD) technology, the duty cycle must not
exceed 38 percent in the 2305-2317.5 MHz and 2347.5-2360 MHz bands. For
mobile and portable stations using frequency division duplex (FDD)
technology, the duty cycle must not exceed 12.5 percent in the
2315-2317.5 MHz band and must not exceed 25 percent in the 2305-2315
MHz band. Mobile and portable stations using FDD technology are
restricted to transmitting in the 2305-2317.5 MHz band. Power averaging
shall not include intervals in which the transmitter is off.
(ii) Mobile and portable stations are not permitted to operate in the
2317.5-2320 MHz and 2345-2347.5 MHz bands.
(iii) Automatic transmit power control. Mobile and portable stations
transmitting in the 2305-2317.5 MHz band or in the 2347.5-2360 MHz band
must employ automatic transmit power control when operating so the
stations operate with the minimum power necessary for successful
communications.
(iv) Prohibition on external vehicle-mounted antennas. The use of
external vehicle-mounted antennas for mobile and portable stations
transmitting in the 2305-2317.5 MHz band or the 2347.5-2360 MHz band is
prohibited.
(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 § 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 § 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 § 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 § 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 § § 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 § 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 § 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 § 27.55(b). The antenna height
for such stations is limited only to the extent required to satisfy the
requirements of § 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 § 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) an equivalent isotropically radiated power (EIRP) of 3280 watts
when transmitting with an emission bandwidth of 1 MHz or less;
(B) an EIRP of 3280 watts/MHz when transmitting with an emission
bandwidth greater than 1 MHz.
(2) The power of each fixed or base station transmitting in the
2110-2155 MHz band and situated in any geographic location other than
that described in paragraph (d)(1) is limited to:
(A) an equivalent isotropically radiated power (EIRP) of 1640 watts
when transmitting with an emission bandwidth of 1 MHz or less;
(B) an EIRP of 1640 watts/MHz when transmitting with an emission
bandwidth greater than 1 MHz.
(3) A licensee operating a base or fixed station in the 2110-2155 MHz
band utilizing a power greater than 1640 watts EIRP and greater than
1640 watts/MHz EIRP must coordinate such operations in advance with all
Government and non-Government satellite entities in the 2025-2110 MHz
band. Operations with power greater than 1640 watts EIRP and greater
than 1640 watts/MHz EIRP must be coordinated in advance with the
following licensees authorized to operate within 120 kilometers (75
miles) of the base or fixed station operating in this band: all
Broadband Radio Service (BRS) licensees authorized under part 27 in the
2155-2160 MHz band and all advanced wireless services (AWS) licensees
authorized to operate on adjacent frequency blocks in the 2110-2155 MHz
band.
(4) Fixed, mobile, and portable (hand-held) stations operating in the
1710-1755 MHz band are limited to 1 watt EIRP. Fixed stations operating
in this band are limited to a maximum antenna height of 10 meters above
ground. Mobile and portable stations operating in this band must employ
a means for limiting power to the minimum necessary for successful
communications.
(5) Equipment employed must be authorized in accordance with the
provisions of § 24.51. 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 (d)(6) of this section. 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.
(6) 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.
(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 EB§
(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 § 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 § 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 § 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 § 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; 73 FR 24184 , May 2, 2008; 75 FR 45070 , Aug. 2, 2010]
Effective Date Notes: 1. At 72 FR 27709 , May 16, 2007, § 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, § 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 § 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.
Goto Section: 27.27 | 27.51
Goto Year: 2009 |
2011
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