§ 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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