Goto Section: 25.217 | 25.219 | Table of Contents
FCC 25.218
Revised as of October 1, 2014
Goto Year:2013 |
2015
§ 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:
29.5-25log10th dBW/4 kHz For 1.5DEG <=th <=7DEG
8.5 dBW/4 kHz For 7DEG 7.0DEG. For th greater than
7.0DEG, 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:
32.5-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-9.5 dBW/4 kHz For 48DEG | 7.0DEG. For th greater than 7.0DEG, 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)-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-12.7-10log10(N) dBW/4 kHz For 48DEG | 7.0DEG. For th greater than
7.0DEG, 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:
24-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-18 dBW/4 kHz For 48DEG | 7.0DEG. For th greater than 7.0DEG, 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)-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-24-10log10(N) dBW/4 kHz For 48DEG | 7.0DEG. For th greater
than 7.0DEG, 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:
24-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-18 dBW/4 kHz For 48DEG | 7.0DEG. For th greater than 7.0DEG, 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)-25log10th dBW/4 kHz For 3DEG <=th <=48DEG
-24-10log10(N) dBW/4 kHz For 48DEG | 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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Goto Section: 25.217 | 25.219
Goto Year: 2013 |
2015
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