§ 25.138   Licensing requirements for GSO FSS earth stations in the
conventional Ka-band and the 24.75-25.25 GHz band.

   (a) Applications for earth station licenses in the GSO FSS in the
   conventional Ka-band or the 24.75-25.25 GHz band that indicate that the
   following requirements will be met and include the information required
   by relevant provisions in § § 25.115 and 25.130 may be routinely
   processed:

   (1) The EIRP density of co-polarized signals in the plane tangent to
   the GSO arc, as defined in § 25.103, will not exceed the following
   values under clear sky conditions:
   32.5-25log(θ) dBW/MHz for 2.0° ≤ θ ≤ 7°.
   11.5          dBW/MHz for 7° ≤ θ ≤ 9.2°
   35.5-25log(θ) dBW/MHz for 9.2° ≤ θ ≤ 19.1°
   3.5           dBW/MHz for 19.1° < θ ≤ 180°

   Where:

   θ is the angle in degrees from a line from the earth station antenna to
   the assigned orbital location of the target satellite.

   (2) In the plane perpendicular to the GSO arc, as defined in § 25.103,
   the EIRP density of co-polarized signals will not exceed the following
   values under clear sky conditions:
   35.5-25log(θ) dBW/MHz for 3.5° ≤ θ ≤ 7°
   14.4          dBW/MHz for 7° < θ ≤ 9.2°
   38.5-25log(θ) dBW/MHz for 9.2° < θ ≤ 19.1°
   6.5           dBW/MHz for 19.1° < θ ≤ 180°

   Where θ is as defined in paragraph (a)(1) of this section.

   (3) The EIRP density levels specified in paragraphs (a)(1) and (2) of
   this section may be exceeded by up to 3 dB, for values of θ > 7°, over
   10% of the range of theta (θ) angles from 7-180° on each side of the
   line from the earth station to the target satellite.

   (4) The EIRP density of cross-polarized signals will not exceed the
   following values in the plane tangent to the GSO arc or in the plane
   perpendicular to the GSO arc under clear sky conditions:
   22.5-25log(θ) dBW/MHz for
   2.0° < θ ≤ 7.0°

   Where θ is as defined in paragraph (a)(1) of this section.

   (5) A license application for earth station operation in a network
   using variable power density control of earth stations transmitting
   simultaneously in shared frequencies to the same target satellite
   receiving beam may be routinely processed if the applicant certifies
   that the aggregate off-axis EIRP density from all co-frequency earth
   stations transmitting simultaneously to the same target satellite
   receiving beam, not resulting from colliding data bursts transmitted
   pursuant to a contention protocol, will not exceed the off-axis EIRP
   density limits permissible for a single earth station, as specified in
   paragraphs (a)(1) through (a)(4) of this section.

   (6) The pfd at the Earth's surface produced by emissions from a space
   station operating in the conventional Ka-band, for all conditions
   including clear sky, and for all methods of modulation, shall not
   exceed a level of −118 dBW/m2/MHz, in addition to the limits specified
   in § 25.208(d).

   (b) Operation with off-axis EIRP density exceeding a relevant envelope
   specified in paragraph (a) of this section and applications proposing
   such operation are subject to coordination requirements in § 25.220.

   (c)-(e) [Reserved]

   (f) The holder of a blanket license pursuant to this section will be
   responsible for operation of any transceiver to receive service
   provided by that licensee or provided by another party with the blanket
   licensee's consent. Space station operators may not transmit
   communications to or from user transceivers in the United States in the
   18.3-18.8 GHz, 19.7-20.2 GHz, 28.35-28.6 GHz, or 29.25-30.0 GHz band
   unless such communications are authorized under an FCC earth station
   license.

   [ 65 FR 54169 , Sept. 7, 2000, as amended at  66 FR 63515 , Dec. 7, 2001;
    68 FR 16966 , Apr. 8, 2003;  69 FR 5710 , Feb. 6, 2004;  73 FR 70900 , Nov.
   24, 2008;  79 FR 8319 , Feb. 12, 2014;  81 FR 55331 , Aug. 18, 2016;  83 FR 34490 , July 20, 2018]

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