Goto Section: 25.208 | 25.210 | Table of Contents
FCC 25.209
Revised as of September 1, 2021
Goto Year:2020 |
2022
§ 25.209 Earth station antenna performance standards.
(a) Except as provided in paragraph (f) of this section, the
co-polarization gain of any earth station antenna operating in the FSS
and transmitting to a GSO satellite, including earth stations providing
feeder links for satellite services other than FSS, may not exceed the
following limits:
(1) In the plane tangent to the GSO arc, as defined in § 25.103, for
earth stations not operating in the conventional Ku-band, the
24.75-25.25 GHz band, or the 28.35-30 GHz 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 a line from the earth station
antenna to the assigned orbital location of the target satellite, and
dBi refers to dB relative to an isotropic radiator. This envelope may
be exceeded by up to 3 dB in 10% of the range of θ angles from ±7-180°,
and by up to 6 dB in the region of main reflector spillover energy.
(2) In the plane tangent to the GSO arc, for earth stations operating
in the 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 ≤ 19.1°.
0 dBi for 19.1° < θ ≤ 180°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 3 dB in 10% of the range of θ
angles from ±7-180°, and by up to 6 dB in the region of main reflector
spillover energy.
(3) In the plane tangent to the GSO arc, for earth stations operating
in the 24.75-25.25 GHz or 28.35-30 GHz bands:
29-25log10θ dBi for 2° ≤ θ ≤ 7°.
8 dBi for 7° < θ ≤ 9.2°.
32-25log10θ dBi for 9.2° < θ ≤ 19.1°.
0 dBi for 19.1° < θ ≤ 180°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 3 dB in 10% of the range of θ
angles from ±7-180°, and by up to 6 dB in the region of main reflector
spillover energy.
(4) In the plane perpendicular to the GSO arc, as defined in § 25.103,
for earth stations not operating in the conventional Ku-band, the
24.75-25.25 GHz band, or the 28.35-30 GHz 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 as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 6 dB in 10% of the range of θ
angles from ±3-180°, and by up to 6 dB in the region of main reflector
spillover energy.
(5) In the plane perpendicular to the GSO arc, for earth stations
operating in the 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 ≤ 19.1°.
0 dBi for 19.1° < θ ≤ 180°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 6 dB in 10% of the range of θ
angles from ±3-180°, and by up to 6 dB in the region of main reflector
spillover energy.
(6) In the plane perpendicular to the GSO arc, for earth stations
operating in the 24.75-25.25 GHz or 28.35-30 GHz bands:
Outside the main beam, the gain of the antenna shall lie below the
envelope defined by:
32-25log10θ dBi for 3.5° < θ ≤ 7°.
10.9 dBi for 7° < θ ≤ 9.2°.
35-25log10θ dBi for 9.2° < θ ≤ 19.1°.
3 dBi for 19.1° < θ ≤ 180°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 6 dB in 10% of the range of θ
angles from ±3-180°, and by up to 6 dB in the region of main reflector
spillover energy.
(b) Except as provided in paragraph (f) of this section, the off-axis
cross-polarization gain of any antenna used for transmission from an
FSS earth station to a GSO satellite, including earth stations
providing feeder links for satellite services other than FSS, may not
exceed the following limits:
(1) In the plane tangent to the GSO arc, for earth stations not
operating in the 24.75-25.25 GHz or 28.35-30 GHz bands:
19-25log10θ dBi for 1.8° < θ ≤ 7°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
(2) In the plane perpendicular to the GSO arc, for earth stations not
operating in the 24.75-25.25 GHz or 28.35-30 GHz bands:
19-25log10θ dBi for 3° < θ ≤ 7°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
(3) In the plane tangent to the GSO arc or in the plane perpendicular
to the GSO arc, for earth stations operating in the 24.75-25.25 GHz or
28.35-30 GHz bands:
19-25log10θ dBi for 2° < θ ≤ 7°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
(c)(1) An earth station licensed for operation with a GSO FSS space
station or registered for reception of transmissions from such a space
station pursuant to § 25.115(b)(1) and (b)(3) is not entitled to
protection from interference from authorized operation of other
stations that would not cause harmful interference to that earth
station if it were using an antenna with receive-band gain patterns
conforming to the levels specified in paragraphs (a) and (b) of this
section.
(2) A 17/24 GHz BSS telemetry earth station is not entitled to
protection from harmful interference from authorized space station
operation that would not cause harmful interference to that earth
station if it were using an antenna with receive-band gain patterns
conforming to the levels specified in paragraphs (a) and (b) of this
section. Receive-only earth stations in the 17/24 GHz BSS are entitled
to protection from harmful interference caused by other space stations
to the extent indicated in § 25.224.
(d) [Reserved]
(e) An earth station using asymmetrical antennas without skew angle
adjustment capability must comply with the gain values specified in
paragraph (a)(1) of this section, in the plane orthogonal to the to the
main plane of the antenna, or, alternatively, in the plane
corresponding to the maximum skew angle experienced at any location at
which the earth station may be located.
(f) A GSO FSS earth station with an antenna that does not conform to
the applicable 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. This demonstration must show that
the transmissions of the earth station comport with the requirements in
§ 25.218 or the applicant must demonstrate that the operations of the
earth station have been coordinated under § 25.220.
(g) [Reserved]
(h) The gain of any transmitting antenna in a gateway earth station
communicating with NGSO FSS satellites in the 10.7-11.7 GHz,
12.75-13.15 GHz, 13.2125-13.25 GHz, 13.8-14.0 GHz, and/or 14.4-14.5 GHz
bands must lie below the envelope defined as follows:
29-25log10(θ) dBi for 1° ≤ θ ≤ 36°.
−10 dBi for 36° ≤ θ ≤ 180°.
Where θ and dBi are as defined in paragraph (a)(1) of this section.
This envelope may be exceeded by up to 3 dB in 10% of the range of θ
angles from ±7-180°.
[ 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; 81 FR 55336 , Aug. 18, 2016; 83 FR 34491 , July 20, 2018; 84 FR 53655 , Oct. 8,
2019; 85 FR 44787 , July 24, 2020]
Goto Section: 25.208 | 25.210
Goto Year: 2020 |
2022
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