Goto Section: 25.203 | 25.205 | Table of Contents
FCC 25.204
Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 25.204 Power limits.
(a) In bands shared coequally with terrestrial radio communication services,
the equivalent isotropically radiated power transmitted in any direction
towards the horizon by an earth station, other than an ESV, operating in
frequency bands between 1 and 15 GHz, shall not exceed the following limits
except as provided for in paragraph (c) of this section:
+40 dBW in any 4 kHz band for Θ ≤ 0 °
+40 + 3Θ dBW in any 4 kHz band for 0 ° < Θ ≤ 5 °
where Θ is the angle of elevation of the horizon viewed from the center of
radiation of the antenna of the earth station and measured in degrees as
positive above the horizontal plane and negative below it.
(b) In bands shared coequally with terrestrial radiocommunication services,
the equivalent isotropically radiated power transmitted in any direction
towards the horizon by an earth station operating in frequency bands above
15 GHz shall not exceed the following limits except as provided for in
paragraph (c) of this section:
+64 dBW in any 1 MHz band for Θ ≤ 0 °
+64 + 3 Θ dBW in any 1 MHz band for 0 ° < Θ ≤ 5 °
where Θ is as defined in paragraph (a) of this section.
(c) For angles of elevation of the horizon greater than 5 ° there shall be no
restriction as to the equivalent isotropically radiated power transmitted by
an earth station towards the horizon.
(d) Notwithstanding the e.i.r.p. and e.i.r.p. density limits specified in
the station authorization, each earth station transmission shall be
conducted at the lowest power level that will provide the required signal
quality as indicated in the application and further amended by coordination
agreements.
(e) For operations at frequencies above 10 GHz, earth station operators may
exceed the uplink e.i.r.p. and e.i.r.p. density limits specified in the
station authorization under the conditions of uplink fading due to
precipitation by an amount not to exceed 1 dB above the actual amount of
monitored excess attenuation over clear sky propagation conditions. The
e.i.r.p. levels shall be returned to normal as soon as the attenuating
weather pattern subsides. The maximum power level for power control purposes
shall be coordinated between and among adjacent satellite operators.
(f) In the band 13.75–14 GHz, an earth station in the fixed-satellite
service shall have a minimum antenna diameter of 4.5 m and the e.i.r.p. of
any emission should be at least 68 dBW and should not exceed 85 dBW. The
e.i.r.p. density of emissions from any earth station in the FSS operating
with a space station in geostationary-satellite orbit shall not exceed 71
dBW in any 6 MHz band from 13.77 to 13.78 GHz. The e.i.r.p. density of
emissions from any earth station in the FSS operating with a space station
in non-geostationary-satellite orbit shall not exceed 51 dBW in any 6 MHz
band from 13.77 to 13.78 GHz. Automatic power control may be used to
increase the e.i.r.p. density in the 6 MHz band in this frequency range to
compensate for rain attenuation, to the extent that the power flux-density
at the FSS space station does not exceed the value resulting from use by an
earth station of an e.i.r.p. of 71 dBW or 51 dBW, as appropriate, in the 6
MHz band in clear-sky conditions.
(g) All earth stations in the Fixed Satellite Service in the 20/30 GHz band,
and feeder link earth stations operating in the 24.75–25.25 GHz band
(Earth-to-space) and providing service to geostationary satellites in the
17/24 GHz BSS, shall employ uplink adaptive power control or other methods
of fade compensation such that the earth station transmissions shall be
conducted at the power level required to meet the desired link performance
while reducing the level of mutual interference between networks.
(h) ESV transmissions in the 5925–6425 MHz (Earth-to-space) band shall not
exceed an e.i.r.p. spectral density towards the radio-horizon of 17 dBW/MHz,
and shall not exceed an e.i.r.p. towards the radio-horizon of 20.8 dBW. The
ESV network shall shut-off the ESV transmitter if the e.i.r.p. spectral
density towards the radio-horizon or e.i.r.p. towards the radio-horizon are
exceeded.
(i) Within 125 km of the TDRSS sites identified in Sec. 25.222(d), ESV
transmissions in the 14.0–14.2 GHz (Earth-to-space) band shall not exceed an
e.i.r.p. spectral density towards the horizon of 12.5 dBW/MHz, and shall not
exceed an e.i.r.p. towards the horizon of 16.3 dBW.
[ 48 FR 40255 , Sept. 6, 1983, as amended at 58 FR 13420 , Mar. 11, 1993; 61 FR 52307 , Oct. 7, 1996; 62 FR 61457 , Nov. 18, 1997; 66 FR 10623 , Feb. 16, 2001;
70 FR 4784 , Jan. 31, 2005; 70 FR 32255 , June 2, 2005; 72 FR 50029 , Aug. 29,
2007]
Goto Section: 25.203 | 25.205
Goto Year: 2006 |
2008
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