FCC 25.218 Revised as of December 4, 2012
Goto Year:2011 |
2013
§ 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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