FCC 101.113 Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 101.113 Transmitter power limitations.
(a) On any authorized frequency, the average power delivered to an antenna
in this service must be the minimum amount of power necessary to carry out
the communications desired. Application of this principle includes, but is
not to be limited to, requiring a licensee who replaces one or more of its
antennas with larger antennas to reduce its antenna input power by an amount
appropriate to compensate for the increased primary lobe gain of the
replacement antenna(s). In no event shall the average equivalent
isotropically radiated power (EIRP), as referenced to an isotropic radiator,
exceed the values specified below. In cases of harmful interference, the
Commission may, after notice and opportunity for hearing, order a change in
the effective radiated power of this station. Further, the output power of a
transmitter on any authorized frequency in this service may not exceed the
following:
Frequency band (MHz) Maximum allowable EIRP^1,2
Fixed^1,^2(dBW) Mobile (dBW)
928.0–929.0(2) +17
932.0–932.5(2) +17
932.5–935.0 +40
941.0–941.5(2) +30 +14
941.5–944.0 +40
952.0–960.0(2) +40 +14
1,850–1,990 +45
2,110–2,150 +45
2,150–2,180^3 +45
2,180–2,200 +45
2,450–2,500 +45
2,500–2,686
2,686–2,690 +45
3,700–4,200 +55
5,925–6,425 +55
6,425–6,525 +35
6,525–6,875 +55
10,550 to 10,600^5 +55
10,600 to 10,680^5 +40
10,700–11,700 +55
12,200–12,700^11 +50
12,700–13,200^4 +50
13,200–13,250^4 +55
14,200–14,400^12 +45
17,700–18,600 +55
18,600–18,800^6 +35
18,800–19,700 ^5+55
21,200–23,600^10 +55
24,250–25,250 ^5+55
27,500–28,350^9 +55
29,100–29,250 (^7)
31,000 to 31,075^8,9 30 dBW/MHz 30 dBW/MHz
31,075 to 31,225^8,9 30 dBW/MHz 30 dBW/MHz
31,225 to 31,300^8,9 30 dBW/MHz 30 dBW/MHz
38,600–40,000 +55
92,000–95,000 +55 +55
^1Per polarization.
^2For multiple address operations, see Sec. 101.147. Remote alarm units that are
part of a multiple address central station projection system are authorized
a maximum of 2 watts.
^3When an omnidirectional antenna is authorized in the 2150–2160 MHz band,
the maximum power shall be 60 dBm.
^4Also see Sec. 101.145.
^5The output power of a DEMS System nodal transmitter shall not exceed 0.5
watt per 250 kHz. The output power of a DEMS System user transmitter shall
not exceed 0.04 watt per 250 kHz. The transmitter power in terms of the
watts specified is the peak envelope power of the emission measured at the
associated antenna input port. The operating power shall not exceed the
authorized power by more than 10 percent of the authorized power in watts at
any time. Frequencies from 10,600–10,680 MHz are subject to footnote US265
in the Table of Frequency Allocations in Sec. 2.106 of the Commission's Rules.
Stations authorized prior to April 1, 2003 to exceed the 40 dBW limit may
continue to operate at their authorized output power level indefinitely,
provided that neither end point of the relevant link is relocated.
^6Maximum power delivered to the antenna shall not exceed -3 dBw.
^7See Sec. 101.113(c).
^8For stations authorized prior to March 11, 1997, and for non-Local
Multipoint Distribution Service stations authorized pursuant to applications
refiled no later than June 26, 1998, the transmitter output power shall not
exceed 0.050 watt.
^9For subscriber transceivers authorized in these bands, the EIRP shall not
exceed 55 dBw or 42 dBw/MHz.
^10See Sec. 101.147(s).
^11The EIRP for MVDDS stations is limited to 14.0 dBm per 24 MHz (−16.0 dBW
per 24 MHz). Incumbent point-to-point stations may use up to +50 dBW except
for low power systems which were licensed under Sec. 101.147(q).
^12Beginning March 1, 2005, no new LTTS operators will be licensed and no
existing LTTS licensees will be renewed in the 14.2–14.4 GHz band.
^13The maximum transmitter power is limited to 3 watts (5 dBW) unless a
proportional reduction in maximum authorized EIRP is required under
Sec. 101.115. The maximum transmitter power spectral density is limited to 150
mW per 100 MHz.
(b) The power of transmitters that use Automatic Transmitter Power Control
shall not exceed the power input or output specified in the instrument of
station authorization. The power of non-ATPC transmitters shall be
maintained as near as practicable to the power input or output specified in
the instrument of station authorization.
(c)(1) Transmitter power limitations. Point-to-point stations in the
29.1–29.25 GHz band for the LMDS backbone between LMDS hubs shall be limited
to a maximum allowable e.i.r.p. density per carrier of 23 dBW/MHz in any one
megahertz in clear air, and may exceed this limit by employment of adaptive
power control in cases where link propagation attenuation exceeds the clear
air value due to precipitation and only to the extent that the link is
impaired.
(2) Hub transmitter EIRP spectral area, density limit. LMDS applicants shall
demonstrate that, under clear air operating conditions, the maximum
aggregate of LMDS transmitting hub stations in a Basic Trading Area in the
29.1–29.25 GHz band will not transmit a co-frequency hub-to-subscriber
e.i.r.p. spectral area density in any azimuthal direction in excess of X
dBW/(MHz-km^2 ) when averaged over any 4.375 MHz band, where X is defined in
Table 1. Individual hub stations may exceed their clear air e.i.r.p.s by
employment of adaptive power control in cases where link propagation
attenuation exceeds the clear air value and only to the extent that the link
is impaired.
(i) The e.i.r.p. aggregate spectral area density is calculated as follows:
[MATH: :MATH]
where:
N = number of co-frequency hubs in BTA.
A = Area of BTA in km^2 .
pi = spectral power density into antenna of i-th hub (in W/MHz).
gi = gain of i-th hub antenna at zero degree elevation angle.
Each pi and gi are in the same 1 MHz within the designated frequency band.
(ii) The climate zones in Table 1 are defined for different geographic
locations within the US as shown in Appendix 28 of the ITU Radio
Regulations.
Table 1^1
Climate zone e.i.r.p. Spectral Density (Clear Air) (dBW/MHz-km^2)^2
1 −23
2 −25
3,4,5 −26
^1LMDS system licensees in two or more BTAs may individually or collectively
deviate from the spectral area density computed above by averaging the power
over any 200 km by 400 km area, provided that the aggregate interference to
the satellite receiver is no greater than if the spectral area density were
as specified in Table 1. A showing to the Commission comparing both methods
of computation is required and copies shall be served on any affected
non-GSO 20/30 GHz MSS providers.
^2See Sec. 21.1007(c)(i) for the population density of the BTA.
(3) Hub transmitter e.i.r.p. spectral area density limit at elevation angles
above the horizon. LMDS applicants shall demonstrate that, under clear air
operating conditions, the maximum aggregate of LMDS transmitting hub
stations in a Basic Trading Area in the 29.1–29.25 GHz band will not
transmit a co-frequency hub-to-subscriber e.i.r.p. spectral area density in
any azimuthal direction in excess of X dBW/(MHz-km^2 ) when averaged over
any 4.375 MHz band where X is defined in Table 2. Individual hub stations
may exceed their clear air e.i.r.p.s by employment of adaptive power control
in cases where link propagation attenuation exceeds the clear air value and
only to the extent that the link is impaired.
(i) The e.i.r.p. aggregate spectral area density is calculated as follows:
[MATH: :MATH]
where:
N = number of co-frequency hubs in BTA.
A = Area of BTA in km^2 .
e.i.r.p. (ai) = equivalent isotropic radiated spectral power density of the
i-th hub (in W/MHz) at elevation angle a where a is the angle in degrees of
elevation above horizon. e.i.r.p.(0 °) is the hub e.i.r.p. area density at
the horizon used in Section 101.113c(2). The nominal antenna pattern will be
used for elevation angles between 0 ° and 8 °, and average levels will be used
for angles beyond 8 °, where average levels will be calculated by sampling
the antenna patterns in each 1 ° interval between 8 ° and 9015, dividing by
83.
Table 2
Elevation angle (a) Relative e.i.r.p. density (dBW/MHz-km^2)
0 ° ≤a≤ 4.0 ° e.i.r.p.(a) = e.i.r.p.(0 °) + 20 log (sinΠ x)(1/Π x) where x = (a
+ 1)/7.5 °.
4.0 ° < a ≤ 7.7 ° e.i.r.p.(a) = e.i.r.p.(0 °) - 3.85a + 7.7.
a > 7.7 ° e.i.r.p.(a) = e.i.r.p.(0 °) - 22.
(ii) LMDS system licensees in two or more BTAs may individually or
collectively deviate from the spectral area density computed above by
averaging the power over any 200 km by 400 km area, provided that the
aggregate interference to the satellite receiver is no greater than if the
spectral area density were as specified in Table 1. A showing to the
Commission comparing both methods of computation is required and copies
shall be served on any affected non-GSO MSS providers.
(4) Power reduction techniques. LMDS hub transmitters shall employ methods
to reduce average power levels received by non-geostationary mobile
satellite receivers, to the extent necessary to comply with paragraphs
(c)(1) and (c)(2) of this section, by employing the methods set forth below:
(i) Alternate polarizations. LMDS hub transmitters in the LMDS service area
may employ both vertical and horizontal linear polarizations such that 50
percent (plus or minus 10 percent) of the hub transmitters shall employ
vertical polarization and 50 percent (plus or minus 10 percent) shall employ
horizontal polarization.
(ii) Frequency interleaving. LMDS hub transmitters in the LMDS service area
may employ frequency interleaving such that 50 percent (plus or minus 10
percent) of the hub transmitters shall employ channel center frequencies
which are different by one-half the channel bandwidth of the other 50
percent (plus or minus 10 percent) of the hub transmitters.
(iii) Alternative methods. As alternatives to paragraphs (c)(4)(i) and
(c)(4)(ii) of this section, LMDS operators may employ such other methods as
may be shown to achieve equivalent reductions in average power density
received by non-GSO MSS satellite receivers.
[ 61 FR 26677 , May 28, 1996, as amended at 61 FR 44182 , Aug. 28, 1996; 62 FR 23167 , Apr. 29, 1997; 62 FR 24582 , May 6, 1997; 63 FR 9448 , Feb. 25, 1998;
63 FR 14039 , Mar. 24, 1998; 65 FR 38329 , June 20, 2000; 66 FR 35110 , July 3,
2001; 67 FR 43038 , June 26, 2002; 68 FR 4957 , Jan. 31, 2003; 68 FR 12776 ,
Mar. 17, 2003; 69 FR 3267 , Jan. 23, 2004; 70 FR 4787 , Jan. 31, 2005]
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:MATH]
where:
N = number of co-frequency hubs in BTA.
A = Area of BTA in km^2 .
pi = spectral power density into antenna of i-th hub (in W/MHz).
gi = gain of i-th hub antenna at zero degree elevation angle.
Each pi and gi are in the same 1 MHz within the designated frequency band.
(ii) The climate zones in Table 1 are defined for different geographic
locations within the US as shown in Appendix 28 of the ITU Radio
Regulations.
Table 1^1
Climate zone e.i.r.p. Spectral Density (Clear Air) (dBW/MHz-km^2)^2
1 −23
2 −25
3,4,5 −26
^1LMDS system licensees in two or more BTAs may individually or collectively
deviate from the spectral area density computed above by averaging the power
over any 200 km by 400 km area, provided that the aggregate interference to
the satellite receiver is no greater than if the spectral area density were
as specified in Table 1. A showing to the Commission comparing both methods
of computation is required and copies shall be served on any affected
non-GSO 20/30 GHz MSS providers.
^2See Sec. 21.1007(c)(i) for the population density of the BTA.
(3) Hub transmitter e.i.r.p. spectral area density limit at elevation angles
above the horizon. LMDS applicants shall demonstrate that, under clear air
operating conditions, the maximum aggregate of LMDS transmitting hub
stations in a Basic Trading Area in the 29.1–29.25 GHz band will not
transmit a co-frequency hub-to-subscriber e.i.r.p. spectral area density in
any azimuthal direction in excess of X dBW/(MHz-km^2 ) when averaged over
any 4.375 MHz band where X is defined in Table 2. Individual hub stations
may exceed their clear air e.i.r.p.s by employment of adaptive power control
in cases where link propagation attenuation exceeds the clear air value and
only to the extent that the link is impaired.
(i) The e.i.r.p. aggregate spectral area density is calculated as follows:
[MATH: 
:MATH]
where:
N = number of co-frequency hubs in BTA.
A = Area of BTA in km^2 .
e.i.r.p. (ai) = equivalent isotropic radiated spectral power density of the
i-th hub (in W/MHz) at elevation angle a where a is the angle in degrees of
elevation above horizon. e.i.r.p.(0 °) is the hub e.i.r.p. area density at
the horizon used in Section 101.113c(2). The nominal antenna pattern will be
used for elevation angles between 0 ° and 8 °, and average levels will be used
for angles beyond 8 °, where average levels will be calculated by sampling
the antenna patterns in each 1 ° interval between 8 ° and 9015, dividing by
83.
Table 2
Elevation angle (a) Relative e.i.r.p. density (dBW/MHz-km^2)
0 ° ≤a≤ 4.0 ° e.i.r.p.(a) = e.i.r.p.(0 °) + 20 log (sinΠ x)(1/Π x) where x = (a
+ 1)/7.5 °.
4.0 ° < a ≤ 7.7 ° e.i.r.p.(a) = e.i.r.p.(0 °) - 3.85a + 7.7.
a > 7.7 ° e.i.r.p.(a) = e.i.r.p.(0 °) - 22.
(ii) LMDS system licensees in two or more BTAs may individually or
collectively deviate from the spectral area density computed above by
averaging the power over any 200 km by 400 km area, provided that the
aggregate interference to the satellite receiver is no greater than if the
spectral area density were as specified in Table 1. A showing to the
Commission comparing both methods of computation is required and copies
shall be served on any affected non-GSO MSS providers.
(4) Power reduction techniques. LMDS hub transmitters shall employ methods
to reduce average power levels received by non-geostationary mobile
satellite receivers, to the extent necessary to comply with paragraphs
(c)(1) and (c)(2) of this section, by employing the methods set forth below:
(i) Alternate polarizations. LMDS hub transmitters in the LMDS service area
may employ both vertical and horizontal linear polarizations such that 50
percent (plus or minus 10 percent) of the hub transmitters shall employ
vertical polarization and 50 percent (plus or minus 10 percent) shall employ
horizontal polarization.
(ii) Frequency interleaving. LMDS hub transmitters in the LMDS service area
may employ frequency interleaving such that 50 percent (plus or minus 10
percent) of the hub transmitters shall employ channel center frequencies
which are different by one-half the channel bandwidth of the other 50
percent (plus or minus 10 percent) of the hub transmitters.
(iii) Alternative methods. As alternatives to paragraphs (c)(4)(i) and
(c)(4)(ii) of this section, LMDS operators may employ such other methods as
may be shown to achieve equivalent reductions in average power density
received by non-GSO MSS satellite receivers.
[ 61 FR 26677 , May 28, 1996, as amended at 61 FR 44182 , Aug. 28, 1996; 62 FR 23167 , Apr. 29, 1997; 62 FR 24582 , May 6, 1997; 63 FR 9448 , Feb. 25, 1998;
63 FR 14039 , Mar. 24, 1998; 65 FR 38329 , June 20, 2000; 66 FR 35110 , July 3,
2001; 67 FR 43038 , June 26, 2002; 68 FR 4957 , Jan. 31, 2003; 68 FR 12776 ,
Mar. 17, 2003; 69 FR 3267 , Jan. 23, 2004; 70 FR 4787 , Jan. 31, 2005]