(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 + 14941.5-944.0...................... + 40 .................952.0-960.0(2)................... + 40 + 141,850-1,990...................... + 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...................... .................. + 356,525-6,875...................... + 55 .................6,875-7,125...................... + 5510,550 to 10,600 \5\............. + 5510,600 to 10,680 \5\............. + 4010,700-11,700.................... + 55 .................12,200-12,700 \11\............... + 5012,700-13,200 \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/MHz31,075 to 31,225 \8 9\........... 30 dBW/MHz 30 dBW/MHz31,225 to 31,300 \8 9\........... 30 dBW/MHz 30 dBW/MHz38,600-40,000.................... + 55 .................71,000-76,000 \13\............... + 55 + 5581,000-86,000 \13\............... + 55 + 5592,000-95,000.................... + 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).\12\ Beginning 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.\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.
(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:[GRAPHIC] [TIFF OMITTED] TR28AU96.732 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:[GRAPHIC] [TIFF OMITTED] TR28AU96.733 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
(a) (dBW/MHz-km \2\)------------------------------------------------------------------------0 <=a <=4.0............................... e.i.r.p.(a) = e.i.r.p.(0) +
20 log (sin[Pi] x)(1/[Pi]
(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]
Editorial Note: For Federal Register citations affecting Sec. 101.113, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.