Goto Section: 25.203 | 25.205 | Table of Contents
FCC 25.204
Revised as of October 1, 2014
Goto Year:2013 |
2015
§ 25.204 Power limits for earth stations.
(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 th <=0DEG
+40 + 3th dBW in any 4 kHz band for 0DEG 29.25-30.0 GHz bands may employ uplink
adaptive power control or other methods of fade compensation. For
stations employing uplink power control, the values in paragraphs
(a)(1), (a)(2), and (a)(4) of § 25.138 may be exceeded by up to 20 dB
under conditions of uplink fading due to precipitation. The amount of
such increase in excess of the actual amount of monitored excess
attenuation over clear sky propagation conditions must not exceed 1.5
dB or 15 percent of the actual amount of monitored excess attenuation
in dB, whichever is larger, with a confidence level of 90 percent
except over transient periods accounting for no more than 0.5 percent
of the time during which the excess is no more than 4.0 dB.
(4) Transmissions in the 24.75-25.25 GHz band from 17/24 GHz BSS
feeder-link earth stations employing power control may exceed the
values in paragraphs (b)(1), (b)(2), and (b)(4) of § 25.223 by up to 20
dB under conditions of uplink fading due to precipitation. The amount
of such increase in excess of the actual amount of monitored excess
attenuation over clear sky propagation conditions must not exceed 1.5
dB or 15 percent of the actual amount of monitored excess attenuation
in dB, whichever is larger, with a confidence level of 90 percent
except over transient periods accounting for no more than 0.5 percent
of the time during which the excess is no more than 4.0 dB.
(f) An earth station in the Fixed-Satellite Service transmitting in the
13.75-14 GHz band must have a minimum antenna diameter of 4.5 m, and
the EIRP of any emission in that band should be at least 68 dBW and
should not exceed 85 dBW.
(g) [Reserved]
(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 § 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.
(j) Within 125 km of the Tracking and Data Relay System Satellite
(TDRSS) sites identified in § 25.226(c), VMES transmissions in the
14.0-14.2 GHz (Earth-to-space) band shall not exceed an EIRP spectral
density towards the horizon of 12.5 dBW/MHz, and shall not exceed an
EIRP towards the horizon of 16.3 dBW.
(k) Within radio line-of-sight of the Tracking and Data Relay System
Satellite (TDRSS) sites identified in § 25.227(c), ESAA transmissions
in the 14.0-14.2 GHz (Earth-to-space) band shall not exceed an EIRP
spectral density towards or below the horizon of 12.5 dBW/MHz, and
shall not exceed an EIRP towards or below 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; 74 FR 57098 , Nov. 4, 2009; 78 FR 8427 , Feb. 6,
2013; 78 FR 14927 , Mar. 8, 2013; 79 FR 8322 , Feb. 12, 2004]
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Goto Section: 25.203 | 25.205
Goto Year: 2013 |
2015
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