Goto Section: 101.111 | 101.115 | Table of Contents

FCC 101.113
Revised as of October 1, 2005
Goto Year:2004 | 2006
Sec.  101.113   Transmitter power limitations.

   Link to an amendment published at  70 FR 4787 , Jan. 31, 2005.

   (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:


------------------------------------------------------------------------
                                       Maximum allowable EIRP \1\ \2\
                                  --------------------------------------
       Frequency band (MHz)          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....................  +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
------------------------------------------------------------------------
\1\ Per polarization.
\2\ For 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.
\3\ When an omnidirectional antenna is authorized in the 2150-2160 MHz
  band, the maximum power shall be 60 dBm.
\4\ Also see  Sec.  101.145.
\5\ The 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.
\6\ Maximum power delivered to the antenna shall not exceed -3 dBw.
\7\ See  Sec.  101.113(c).
\8\ For 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.
\9\ For subscriber transceivers authorized in these bands, the EIRP
  shall not exceed 55 dBw or 42 dBw/MHz.
\10\ See  Sec.  101.147(s).
\11\ The 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).
\13\ The 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\
------------------------------------------------------------------------
                                       e.i.r.p. Spectral Density (Clear
            Climate zone                  Air) (dBW/MHz-km \2\) \2\
------------------------------------------------------------------------
                      1                                  -23
                      2                                  -25
                  3,4,5                                  -26
------------------------------------------------------------------------
\1\ 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 20/30 GHz MSS
  providers.
\2\ See  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
------------------------------------------------------------------------
                                              Relative e.i.r.p. density
            Elevation angle (a)                   (dBW/MHz-km \2\)
------------------------------------------------------------------------
0 ° [le] a [le] 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 [le] 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]


Goto Section: 101.111 | 101.115

Goto Year: 2004 | 2006
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