§  25.218   Off-axis EIRP envelopes for FSS earth station operations.

   (a) This section applies to all earth station applications, except for:

   (1) ESV and VMES applications,

   (2) Analog video earth station applications,

   (3) Applications for feeder-link earth stations in the 17/24 GHz BSS.

   (b) Earth station applications subject to this section are eligible for
   routine processing if they meet the applicable off-axis EIRP envelope
   set forth in this section below. For purposes of this section, the term
   “extended Ku-band” is the 10.7 through 11.7 GHz, 12.75 through 13.25
   GHz, and 13.75 through 14.0 GHz band. The term “conventional Ku-band”
   is defined in §  25.201 of this chapter.

   (c) C-band analog earth station operations. (1) In the plane of the
   geostationary satellite orbit as it appears at the particular earth
   station location:
   29.5-25log[10]θ dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   8.5             dBW/4 kHz For 7�° < θ ≤ 9.2�°
   32.5-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −9.5            dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ is the angle in degrees from the line connecting the focal
   point of the antenna to the target satellite, and the geostationary
   orbit plane is determined by the focal point of the antenna and the
   line tangent to the arc of the geostationary satellite orbit at the
   position of the target satellite. For the purposes of this section, the
   peak EIRP of an individual sidelobe may not exceed the envelope defined
   above for θ between 1.5�° and 7.0�°. For θ greater than 7.0�°, the
   envelope may be exceeded by no more than 10% of the sidelobes, provided
   no individual sidelobe exceeds the envelope given above by more than 3
   dB.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   32.5-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −9.5            dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ is the angle in degrees from the line connecting the focal
   point of the antenna to the target satellite, within any plane that
   includes that line, with the exception of the plane determined by the
   focal point of the antenna and the line tangent to the arc of the
   geostationary satellite orbit at the position of the target satellite.
   For the purposes of this section, the envelope may be exceeded by no
   more than 10% of the sidelobes provided no individual sidelobe exceeds
   the envelope given above by more than 6 dB. The region of the main
   reflector spillover energy is to be interpreted as a single lobe and
   shall not exceed the envelope by more than 6 dB.

   (d) C-band digital earth station operations. (1) In the plane of the
   geostationary satellite orbit as it appears at the particular earth
   station location:
   26.3-10log[10](N)-25log[10]θ  dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   5.3-10log[10](N)              dBW/4 kHz For 7�° < θ ≤ 9.2�°
   29.3 -10log[10](N)-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −12.7-10log[10](N)            dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ and the plane of the geostationary satellite orbit are defined
   in paragraph (c)(1) of this section, and N is defined below. For the
   purposes of this section, the peak EIRP of an individual sidelobe may
   not exceed the envelope defined above for θ between 1.5�° and 7.0�°. For
   θ greater than 7.0�°, the envelope may be exceeded by no more than 10%
   of the sidelobes, provided no individual sidelobe exceeds the envelope
   given above by more than 3 dB. For digital SCPC using frequency
   division multiple access (FDMA) or time division multiple access (TDMA)
   technique, N is equal to one. For digital SCPC using code division
   multiple access (CDMA) technique, N is the maximum number of
   co-frequency simultaneously transmitting earth stations in the same
   satellite receiving beam.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   29.3-10log[10](N)-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −12.7-10log[10](N)           dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ is defined in paragraph (c)(2) of this section, and N is
   defined in paragraph (d)(1) of this section. For the purposes of this
   section, the envelope may be exceeded by no more than 10% of the
   sidelobes provided no individual sidelobe exceeds the envelope given
   above by more than 6 dB. The region of the main reflector spillover
   energy is to be interpreted as a single lobe and shall not exceed the
   envelope by more than 6 dB.

   (e) Conventional Ku-band analog earth station operations. (1) In the
   plane of the geostationary satellite orbit as it appears at the
   particular earth station location:
   21-25log[10]θ dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   0             dBW/4 kHz For 7�° < θ ≤ 9.2�°
   24-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −18           dBW/4 kHz For 48�° < θ ≤ 85�°
   −8            dBW/4 kHz For 85�° < θ ≤ 180�°

   where θ and the plane of the geostationary satellite are defined in
   paragraph (c)(1) of this section. For the purposes of this section, the
   peak EIRP of an individual sidelobe may not exceed the envelope defined
   above for θ between 1.5�° and 7.0�°. For θ greater than 7.0�°, the
   envelope may be exceeded by no more than 10% of the sidelobes, provided
   no individual sidelobe exceeds the envelope given above by more than 3
   dB.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   24-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −18           dBW/4 kHz For 48�° < θ ≤ 85�°
   −8            dBW/4 kHz For 85�° < θ ≤ 180�°

   where θ is defined in paragraph (c)(2) of this section. For the
   purposes of this section, the envelope may be exceeded by no more than
   10% of the sidelobes provided no individual sidelobe exceeds the
   envelope given above by more than 6 dB. The region of the main
   reflector spillover energy is to be interpreted as a single lobe and
   shall not exceed the envelope by more than 6 dB.

   (f) Conventional Ku-band digital earth station operations. (1) In the
   plane of the geostationary satellite orbit as it appears at the
   particular earth station location:
   15-10log[10](N)-25log[10]θ dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   −6-10log[10](N)            dBW/4 kHz For 7�° < θ ≤ 9.2�°
   18-10log[10](N)-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −24-10log[10](N)           dBW/4 kHz For 48�° < θ ≤ 85�°
   −14-10log[10](N)           dBW/4 kHz For 85�° < θ ≤ 180�°

   where θ and the plane of the geostationary satellite orbit are defined
   in paragraph (c)(1) of this section, and N is defined below. For the
   purposes of this section, the peak EIRP of an individual sidelobe may
   not exceed the envelope defined above for θ between 1.5�° and 7.0�°. For
   θ greater than 7.0�°, the envelope may be exceeded by no more than 10%
   of the sidelobes, provided no individual sidelobe exceeds the envelope
   given above by more than 3 dB. For digital SCPC using frequency
   division multiple access (FDMA) or time division multiple access (TDMA)
   technique, N is equal to one. For digital SCPC using code division
   multiple access (CDMA) technique, N is the maximum number of
   co-frequency simultaneously transmitting earth stations in the same
   satellite receiving beam.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   18-10log[10](N)-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −24-10log[10](N)           dBW/4 kHz For 48�° < θ ≤ 85�°
   −14-10log[10](N)           dBW/4 kHz For 85�° < θ ≤ 180�°

   where θ is defined in paragraph (c)(2) of this section, and N is
   defined in paragraph (f)(1) of this section. For the purposes of this
   section, the envelope may be exceeded by no more than 10% of the
   sidelobes provided no individual sidelobe exceeds the envelope given
   above by more than 6 dB. The region of the main reflector spillover
   energy is to be interpreted as a single lobe and shall not exceed the
   envelope by more than 6 dB.

   (g) Extended Ku-band analog earth station operations. (1) In the plane
   of the geostationary satellite orbit as it appears at the particular
   earth station location:
   21-25log[10]θ dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   0             dBW/4 kHz For 7�° < θ ≤ 9.2�°
   24-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −18           dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ and the plane of the geostationary satellite orbit are defined
   in paragraph (c)(1) of this section. For the purposes of this section,
   the peak EIRP of an individual sidelobe may not exceed the envelope
   defined above for θ between 1.5�° and 7.0�°. For θ greater than 7.0�°, the
   envelope may be exceeded by no more than 10% of the sidelobes, provided
   no individual sidelobe exceeds the envelope given above by more than 3
   dB.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   24-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −18           dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ is defined in paragraph (c)(2) of this section. For the
   purposes of this section, the envelope may be exceeded by no more than
   10% of the sidelobes provided no individual sidelobe exceeds the
   envelope given above by more than 6 dB. The region of the main
   reflector spillover energy is to be interpreted as a single lobe and
   shall not exceed the envelope by more than 6 dB.

   (h) Extended Ku-band digital earth station operations. (1) In the plane
   of the geostationary satellite orbit as it appears at the particular
   earth station location:
   15-10log[10](N)-25log[10]θ dBW/4 kHz For 1.5�° ≤ θ ≤ 7�°
   −6-10log[10](N)            dBW/4 kHz For 7�° < θ ≤ 9.2�°
   18-10log[10](N)-25log[10]θ dBW/4 kHz For 9.2�° < θ ≤ 48�°
   −24-10log[10](N)           dBW/4 kHz For 48�° < θ ≤ 180�°

   where θ and the plane of the geostationary satellite orbit are defined
   in paragraph (c)(1) of this section, and N is defined below. For the
   purposes of this section, the peak EIRP of an individual sidelobe may
   not exceed the envelope defined above for θ between 1.5�° and 7.0�°. For
   θ greater than 7.0�°, the envelope may be exceeded by no more than 10%
   of the sidelobes, provided no individual sidelobe exceeds the envelope
   given above by more than 3 dB. For digital SCPC using frequency
   division multiple access (FDMA) or time division multiple access (TDMA)
   technique, N is equal to one. For digital SCPC using code division
   multiple access (CDMA) technique, N is the maximum number of
   co-frequency simultaneously transmitting earth stations in the same
   satellite receiving beam.

   (2) In all other directions, or in the plane of the horizon including
   any out-of-plane potential terrestrial interference paths:
   18-10log[10](N)-25log[10]θ dBW/4 kHz For 3�° ≤ θ ≤ 48�°
   −24-10log[10](N)           dBW/4 kHz For 48�° < θ ≤ 85�°

   where θ is defined in paragraph (c)(2) of this section and N is defined
   in paragraph (h)(1) of this section. For the purposes of this section,
   the envelope may be exceeded by no more than 10% of the sidelobes
   provided no individual sidelobe exceeds the envelope given above by
   more than 6 dB. The region of the main reflector spillover energy is to
   be interpreted as a single lobe and shall not exceed the envelope by
   more than 6 dB.

   [ 73 FR 70902 , Nov. 24, 2008, as amended at  74 FR 57099 , Nov. 4, 2009]

   Effective Date Note: At  74 FR 9962 , Mar. 9, 2009, §  25.218, which
   contains information collection and recordkeeping requirements, became
   effective with approval by the Office of Management and Budget for a
   period of three years.

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