Goto Section: 25.217 | 25.219 | Table of Contents
FCC 25.218
Revised as of October 1, 2018
Goto Year:2017 |
2019
§ 25.218 Off-axis EIRP density envelopes for FSS earth stations transmitting
in certain frequency bands.
(a) This section applies to applications for FSS earth stations
transmitting to GSO space stations in the conventional C-band, extended
C-band, conventional Ku-band, or extended Ku-band, with the following
exceptions:
(1) ESV, VMES, and ESAA applications and
(2) Applications proposing transmission of analog command signals at a
band edge with bandwidths greater than 1 MHz or transmission of any
other type of analog signal with bandwidths greater than 200 kHz.
(b) Earth station applications subject to this section may be routinely
processed if they meet the applicable off-axis EIRP density envelopes
set forth in this section.
(c) Analog earth station operation in the conventional or extended
C-bands. (1) For co-polarized transmissions in the plane tangent to the
GSO arc, as defined in § 25.103:
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 a line from the earth station
antenna to the assigned orbital location of the target satellite. The
EIRP density levels specified for θ > 7° may be exceeded by up to 3 dB
in up to 10% of the range of theta (θ) angles from ±7-180°, and by up
to 6 dB in the region of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc, as defined in § 25.103:
32.5-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 48°.
−9.5 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
19.5-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(d) Digital earth station operation in the conventional or extended
C-bands. (1) For co-polarized transmissions in the plane tangent to the
GSO arc:
26.3-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
5.3 dBW/4 kHz for 7° < θ ≤ 9.2°.
29.3-25log10θ dBW/4 kHz for 9.2° < θ ≤ 48°.
−12.7 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. The EIRP
density levels specified for θ > 7° may be exceeded by up to 3 dB in up
to 10% of the range of theta (θ) angles from ±7-180°, and by up to 6 dB
in the region of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc:
29.3-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 48°.
−12.7 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
16.3-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(4) A license application for earth station operation in a network
using variable power density control of earth stations transmitting
simultaneously in shared frequencies to the same target satellite
receiving beam may be routinely processed if the applicant certifies
that the aggregate off-axis EIRP density from all co-frequency earth
stations transmitting simultaneously to the same target satellite
receiving beam, not resulting from colliding data bursts transmitted
pursuant to a contention protocol, will not exceed the off-axis EIRP
density limits permissible for a single earth station, as specified in
paragraphs (d)(1) through (d)(3) of this section.
(e) Analog earth station operation in the conventional Ku-band. (1) For
co-polarized transmissions in the plane tangent to the GSO arc:
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 ≤ 19.1°.
−8 dBW/4 kHz for 19.1° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. The EIRP
density levels specified for θ > 7° may be exceeded by up to 3 dB in up
to 10% of the range of theta (θ) angles from ±7-180°, and by up to 6 dB
in the region of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc:
24-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 19.1°.
−8 dBW/4 kHz for 19.1° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
11-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(f) Digital earth station operation in the conventional Ku-band. (1)
For co-polarized transmissions in the plane tangent to the GSO arc:
15-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
−6 dBW/4 kHz for 7° < θ ≤ 9.2°.
18-25log10θ dBW/4 kHz for 9.2° < θ ≤ 19.1°.
−14 dBW/4 kHz for 19.1° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. The EIRP
density levels specified for θ > 7° may be exceeded by up to 3 dB in up
to 10% of the range of theta (θ) angles from ±7-180°, and by up to 6 dB
in the region of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc:
18-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 19.1°.
−14 dBW/4 kHz for 19.1° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
5-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(4) A license application for earth station operation in a network
using variable power density control of earth stations transmitting
simultaneously in shared frequencies to the same target satellite
receiving beam may be routinely processed if the applicant certifies
that the aggregate off-axis EIRP density from all co-frequency earth
stations transmitting simultaneously to the same target satellite
receiving beam, not resulting from colliding data bursts transmitted
pursuant to a contention protocol, will not exceed the off-axis EIRP
density limits permissible for a single earth station, as specified in
paragraphs (f)(1) through -(f)(3) of this section.
(g) Analog earth station operation in the extended Ku-band. (1) For
co-polarized transmissions in the plane tangent to the GSO arc:
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 is as defined in paragraph (c)(1) of this section, and N is as
defined in paragraph (d)(1) of this section. The EIRP density levels
specified for θ > 7° may be exceeded by up to 3 dB in up to 10% of the
range of theta (θ) angles from ±7-180°, and by up to 6 dB in the region
of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc:
24-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 48°.
−18 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
11-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(h) Digital earth station operation in the extended Ku-band. (1) For
co-polarized transmissions in the plane tangent to the GSO arc:
15-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
−6 dBW/4 kHz for 7° < θ ≤ 9.2°.
18-25log10θ dBW/4 kHz for 9.2° < θ ≤ 48°.
−24 dBW/4 kHz for 48° < θ ≤ 180°.
Where θ is as defined in paragraph (c)(1) of this section. The EIRP
density levels specified for θ > 7° may be exceeded by up to 3 dB in up
to 10% of the range of theta (θ) angles from ±7-180°, and by up to 6 dB
in the region of main reflector spillover energy.
(2) For co-polarized transmissions in the plane perpendicular to the
GSO arc:
18-25log10θ dBW/4 kHz for 3° ≤ θ ≤ 48°.
−24 dBW/4 kHz for 48° < θ ≤ 85°.
Where θ is as defined in paragraph (c)(1) of this section. These EIRP
density levels may be exceeded by up to 6 dB in the region of main
reflector spillover energy and in up to 10% of the range of θ angles
not included in that region, on each side of the line from the earth
station to the target satellite.
(3) For cross-polarized transmissions in the plane tangent to the GSO
arc and in the plane perpendicular to the GSO arc:
5-25log10θ dBW/4 kHz for 1.5° ≤ θ ≤ 7°.
Where θ is as defined in paragraph (c)(1) of this section.
(4) A license application for earth station operation in a network
using variable power density control of earth stations transmitting
simultaneously in shared frequencies to the same target satellite
receiving beam may be routinely processed if the applicant certifies
that the aggregate off-axis EIRP density from all co-frequency earth
stations transmitting simultaneously to the same target satellite
receiving beam, not resulting from colliding data bursts transmitted
pursuant to a contention protocol, will not exceed the off-axis EIRP
density limits permissible for a single earth station, as specified in
paragraphs (h)(1) through (h)(3) of this section.
(i) Applications for authority for fixed earth station operation in the
5925-6425 MHz or 14.0-14.5 GHz band that do not qualify for routine
processing under relevant criteria in this section, § 25.211 or § 25.212
are subject to the requirements in § 25.220.
[ 81 FR 55339 , Aug. 18, 2016]
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