Goto Section: 25.217 | 25.219 | Table of Contents
FCC 25.218
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 25.218 Off-axis EIRP density envelopes for FSS earth stations transmitting
in certain frequency bands.
(a) This section applies to all applications for Fixed-Satellite Service
earth stations transmitting to geostationary space stations in the C band,
Ku band, or extended Ku band, except for:
(1) ESV, VMES, and ESAA applications, and
(2) Analog video earth station applications.
(b) Earth station applications subject to this section are eligible for
routine processing if they meet the applicable off-axis EIRP density
envelope set forth in this section below. The terms “conventional Ku band”
and “extended Ku band are defined in § 25.103.
(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:
29.5-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
8.5 dBW/4 kHz For 7° <θ ≤9.2°
32.5-25log10θ 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 density 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:
32.5-25log10θ 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:
26.3-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
5.3-10log10(N) dBW/4 kHz For 7° <θ ≤9.2°
29.3 −10log10(N)−25log10θ dBW/4 kHz For 9.2° <θ ≤48°
−12.7-10log10(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 density 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:
29.3-10log10(N)-25log10θ dBW/4 kHz For 3° ≤θ ≤48°
−12.7-10log10(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:
21-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
0 dBW/4 kHz For 7° <θ ≤9.2°
24-25log10θ 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 density 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:
24-25log10θ 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:
15-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
−6-10log10(N) dBW/4 kHz For 7° <θ ≤9.2°
18-10log10(N)-25log10θ dBW/4 kHz For 9.2° <θ ≤48°
−24-10log10(N) dBW/4 kHz For 48° <θ ≤85°
−14-10log10(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 density 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:
18-10log10(N)-25log10θ dBW/4 kHz For 3° ≤θ ≤48°
−24-10log10(N) dBW/4 kHz For 48° <θ ≤85°
−14-10log10(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:
21-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
0 dBW/4 kHz For 7° <θ ≤9.2°
24-25log10θ 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 density 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:
24-25log10θ 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:
15-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤θ ≤7°
−6-10log10(N) dBW/4 kHz For 7° <θ ≤9.2°
18-10log10(N)-25log10θ dBW/4 kHz For 9.2° <θ ≤48°
−24-10log10(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 density 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:
18-10log10(N)-25log10θ dBW/4 kHz For 3° ≤θ ≤48°
−24-10log10(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; 78 FR 8429 , Feb. 6, 2013; 78 FR 14927 , Mar. 8, 2013; 79 FR 8324 , Feb. 12, 2014]
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 3 years.
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