§  25.209   Earth station antenna performance standards.

   (a) The gain of any antenna to be employed in transmission from an
   earth station in the Fixed-Satellite Service shall lie below the
   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 Ka-band or conventional Ku-band:
   29-25log[10]th 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 Ka-band or conventional Ku-band:
   29-25log[10]th dBi For 1.5DEG <=th <=7DEG
   8              dBi For 7DEG 25.224 of this part.

   (d) The patterns specified in paragraphs (a) and (b) of this section
   shall apply to all new earth station antennas initially authorized
   after February 15, 1985 and shall apply to all earth station antennas
   after March 11, 1994.

   (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 the standards of
   paragraphs (a) and (b) of this section will be authorized only if the
   applicant meets its burden of demonstrating that its 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 procedures set
   forth in § §  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) The antenna performance standards of small antennas operating in
   the 12/14 GHz band with diameters as small as 1.2 meters starts at
   1.25DEG instead of 1DEG as stipulated in paragraph (a) of this section.

   (h)(1) The gain of any antennas to be employed in transmission from a
   gateway earth station antenna operating in the frequency bands
   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 and communicating with NGSO FSS satellites shall lie
   below the envelope defined as follows:

   29 - 25log10 (th) dBi - 10 dBi

   1B <=th <=36B

   36B <=th <=180B

   Where: th is the angle in degrees from the axis of the main lobe, and
   dBi refers to 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]

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