Goto Section: 25.208 | 25.210 | Table of Contents
FCC 25.209
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 25.209 Earth station antenna performance standards.
(a) Except as provided in paragraph (f) of this section, the gain of any
antenna to be employed in transmission from an earth station in the
Fixed-Satellite Service shall lie below the relevant 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
20/30 GHz band or conventional Ku-band:
29-25log10θ dBi For 1.5° ≤θ ≤7°
8 dBi For 7° <θ ≤9.2°
32-25log10θ dBi For 9.2° <θ ≤48°
−10 dBi For 48° <θ ≤180°
where θ is the angle in degrees from the axis of the main lobe, and dBi
refers to dB relative to an isotropic radiator. For the purposes of this
section, the peak gain of an individual sidelobe may not exceed the envelope
defined above for θ between 1.5 and 7.0 degrees. For θ 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 20/30
GHz band or conventional Ku-band:
29-25log10θ dBi For 1.5° ≤θ ≤7°
8 dBi For 7° <θ ≤9.2°
32-25log10θ dBi For 9.2° <θ ≤48°
−10 dBi For 48° <θ ≤85°
0 dBi For 85° <θ ≤180°
(3) In all other directions, or in the plane of the horizon including any
out-of-plane potential terrestrial interference paths, for all earth
stations not operating in the 20/30 GHz band or conventional Ku-band:
Outside the main beam, the gain of the antenna shall lie below the envelope
defined by:
32-25log10θ dBi For 3° <θ ≤48°
−10 dBi For 48° <θ ≤180°
where θ and dBi are defined above. 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 gain 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.
(4) In all other directions, or in the plane of the horizon including any
out-of-plane potential terrestrial interference paths, for all earth
stations operating in the 20/30 GHz band or conventional Ku-band:
Outside the main beam, the gain of the antenna shall lie below the envelope
defined by:
32-25log10θ dBi For 3° <θ ≤48°
−10 dBi For 48° <θ ≤85°
0 dBi For 85° <θ ≤180°
where θ and dBi are defined above. 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 gain 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.
(5) Elliptical earth station antennas may be operated only when the major
axis of the antenna is aligned with the plane of the geostationary satellite
orbit as it appears at the particular earth station location.
(b) Except as provided in paragraph (f) of this section, the off-axis
cross-polarization gain of any antenna to be employed in transmission from
an earth station to a space station in the Fixed-Satellite Service shall be
defined as follows:
(1) In the plane of the geostationary satellite orbit as it appears at the
particular earth station location:
19-25log10θ dBi For 1.8° <θ ≤7°
−2 dBi For 7° <θ ≤9.2°
where θ is the angle in degrees from the axis of the main lobe, and dBi
refers to dB relative to an isotropic radiator.
(2) In all other directions, or in the plane of the horizon including any
out-of-plane potential terrestrial interference paths:
19-25log10θ dBi For 3° <θ ≤7°
−2 dBi For 7° <θ ≤9.2°
where θ and dBi are defined above.
(c)(1) Earth station antennas licensed for reception of radio transmissions
from a space station in the Fixed-Satellite Service are protected from radio
interference caused by other space stations only to the degree to which
harmful interference would not be expected to be caused to an earth station
employing an antenna conforming to the referenced patterns defined in
paragraphs (a) and (b) of this section, and protected from radio
interference caused by terrestrial radio transmitters identified by the
frequency coordination process only to the degree to which harmful
interference would not be expected to be caused to an earth station
conforming to the reference pattern defined in paragraphs (a)(3) and (4) of
this section.
(2) 17/24 GHz BSS telemetry earth stations are protected from harmful
interference caused by other space stations to the extent set forth in
paragraph (c)(1) of this section. Receive-only earth stations in the 17/24
GHz BSS are protected from harmful interference caused by other space
stations to the extent set forth in § 25.224 of this part.
(d) [Reserved]
(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 relevant standards in
paragraphs (a) and (b) of this section will be authorized only if the
applicant demonstrates that the 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
requirements in § 25.138, § 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) [Reserved]
(h)(1) The gain of any transmitting gateway earth station antenna operating
in the 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 bands and communicating with NGSO FSS satellites must lie
below the envelope defined as follows:
29-25log10(θ) dBi for 1° ≤ θ ≤ 36°
-10 dBi for 36° < θ ≤ 180°
Where:
θ is the angle in degrees from the axis of the main lobe, and dBi means 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; 79 FR 8322 , Feb. 12, 2014]
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Goto Section: 25.208 | 25.210
Goto Year: 2014 |
2016
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