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:
------------------------------------------------------------------------
Maximum allowable
EIRP \1\ \2\
Frequency Band (MHz) ---------------------
Fixed Mobile
(dBW) (dBW)
------------------------------------------------------------------------
928.0 to 929.0.................................... +17 .........
932.0 to 932.5.................................... +17 .........
932.5 to 935.0.................................... +40 .........
941.0 to 941.5.................................... +30 .........
941.5 to 944.0.................................... +40 .........
952.0 to 960.0 \2\................................ +40 .........
1,850 to 1,990.................................... +45 .........
2,110 to 2,130.................................... +45 .........
2,130 to 2,150.................................... +45 .........
2,150 to 2,160 \3\................................ +45 .........
2,160 to 2,180 \3\................................ +45 .........
2,180 to 2,200.................................... +45 .........
2,450 to 2,500.................................... +45 .........
2,500 to 2,686 \4\................................ ......... .........
2,686 to 2,690 \4\................................ +45 .........
3,700 to 4,200.................................... +55 .........
5,925 to 6,425 \4\................................ +55 .........
6,425 to 6,525 \4\................................ ......... +35
6,525 to 6,875 \4\................................ +55 .........
10,550 to 10,680 \5\.............................. +55 .........
10,700 to 11,700.................................. +55 .........
12,200 to 12,700.................................. +50 .........
12,700 to 13,250 \4\.............................. +50 .........
17,700 to 18,600.................................. +55 .........
18,600 to 18,800 \6\.............................. +35 .........
18,800 to 19,700.................................. +55 .........
21,200 to 23,600 \7\.............................. \5\ +55 .........
24,250 to 25,250.................................. +55 .........
27,500 to 28,350 \9\.............................. 55 .........
29,100 to 29,250.................................. (\7\) .........
31,000 to 31,075 \8\, \9\......................... 30 30
31,075 to 31,225 \8\, \9\......................... 30 30
31,225 to 31,300 \8\, \9\......................... 30 30
38,600 to 40,000.................................. +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 protection
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 watts per 250 KHz. The output power of a DEMS System user
transmitter shall not exceed 0.04 watts 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.
\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, transmitter output
power shall not exceed 0.05 watt.
\9\ For subscriber transceivers authorized in these bands, the EIRP
shall not exceed 55dBW or 42 dBW/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
[[Page 764]]
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 deg.) 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 deg. and
8 deg., and average levels will be used for angles beyond 8 deg., where
average levels will be calculated by sampling the antenna patterns in
each 1 deg. interval between 8 deg. and 9015, dividing by 83.
Table 2
------------------------------------------------------------------------
Relative e.i.r.p. density
Elevation angle (a) (dBW/MHz-km \2\)
------------------------------------------------------------------------
0 deg. a 4.0 deg.. e.i.r.p.(a) = e.i.r.p.(0
deg.) + 20 log (sin x)(1/ x) where
x = (a + 1)/7.5 deg..
4.0 deg. a 7.7 deg........... e.i.r.p.(a) = e.i.r.p.(0
deg.) - 3.85a + 7.7.
a > 7.7 deg............................... e.i.r.p.(a) = e.i.r.p.(0
deg.) - 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)
[[Page 765]]
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]
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