§ 25.209   Earth station antenna performance standards.

   (a) Except as provided in paragraph (f) of this section, the gain of
   any antenna to be employed in transmission from an earth station in the
   Fixed-Satellite Service shall lie below the relevant envelope defined
   in paragraphs (a)(1) through (4) of this section:

   (1) In the plane of the geostationary satellite orbit as it appears at
   the particular earth station location, for earth stations not operating
   in the 20/30 GHz band or conventional Ku-band:
   29-25log10th dBi For 1.5DEG <=th <=7DEG
   8            dBi For 7DEG 7.0 degrees. For th
   greater than 7.0 degrees, the envelope may be exceeded by no more than
   10% of the sidelobes, provided no individual sidelobe exceeds the gain
   envelope given above by more than 3 dB.

   (2) In the plane of the geostationary satellite orbit as it appears at
   the particular earth station location, for earth stations operating in
   the 20/30 GHz band or conventional Ku-band:
   29-25log10th dBi For 1.5DEG <=th <=7DEG
   8            dBi For 7DEG 25.224 of this part.

   (d) [Reserved]

   (e) The operations of any earth station with an antenna not conforming
   to the standards of paragraphs (a) and (b) of this section shall impose
   no limitations upon the operation, location or design of any
   terrestrial station, any other earth station, or any space station
   beyond those limitations that would be expected to be imposed by an
   earth station employing an antenna conforming to the reference patterns
   defined in paragraphs (a) and (b) of this section.

   (f) An earth station with an antenna not conforming to relevant
   standards in paragraphs (a) and (b) of this section will be authorized
   only if the applicant demonstrates that the antenna will not cause
   unacceptable interference. For ESVs in the C-band, this demonstration
   must comply with the procedures set forth in § 25.221. For ESVs in the
   Ku-band, this demonstration must comply with the procedures set forth
   in § 25.222. For VMES, this demonstration shall comply with the
   procedures set forth in § 25.226. For ESAAs, this demonstration shall
   comply with the procedures set forth in § 25.227. For feeder-link earth
   stations in the 17/24 GHz BSS, this demonstration must comply with the
   procedures set forth in § 25.223. For other FSS earth stations, this
   demonstration must comply with the requirements in § 25.138, § 25.218,
   or § 25.220. In any case, the Commission will impose appropriate terms
   and conditions in its authorization of such facilities and operations.

   (g) [Reserved]

   (h)(1) The gain of any transmitting gateway earth station antenna
   operating in the 10.7-11.7 GHz, 12.75-13.15 GHz, 13.2125-13.25 GHz,
   13.8-14.0 GHz, and 14.4-14.5 GHz bands and communicating with NGSO FSS
   satellites must lie below the envelope defined as follows:

   29-25log10(th) dBi for 1DEG <= th <= 36DEG

   -10 dBi for 36DEG < th <= 180DEG

   Where:

   th is the angle in degrees from the axis of the main lobe, and dBi
   means dB relative to an isotropic radiator.

   (2) For the purposes of this section, the peak gain of an individual
   sidelobe may not exceed the envelope defined in paragraph (h)(1) of
   this section.

   [ 48 FR 40255 , Sept. 6, 1983, as amended at  50 FR 2675 , Jan. 18, 1985;
    50 FR 39004 , Sept. 26, 1985;  58 FR 13420 , Mar. 11, 1993;  66 FR 10630 ,
   Feb. 16, 2001;  70 FR 32255 , June 2, 2005;  72 FR 50029 , Aug. 29, 2007;
    73 FR 70901 , Nov. 24, 2008;  74 FR 57099 , Nov. 4, 2009;  78 FR 8427 , Feb.
   6, 2013;  78 FR 14927 , Mar. 8, 2013;  79 FR 8322 , Feb. 12, 2014]

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