Goto Section: 25.217 | 25.219 | Table of Contents

FCC 25.218
Revised as of September 24, 2020
Goto Year:2020 | 2022
  §  25.218   Off-axis EIRP density envelopes for FSS earth stations transmitting
in certain frequency bands.

   (a) This section applies to applications for fixed and temporary-fixed
   FSS earth stations transmitting to geostationary space stations in the
   conventional C-band, extended C-band, conventional Ku-band, extended
   Ku-band, conventional Ka-band, or 24.75-25.25 GHz and applications for
   ESIMs transmitting in the conventional C-band, conventional Ku-band, or
   conventional Ka-band, except for 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) Digital earth station operation in the conventional Ka-band. (1)
   For co-polarized transmissions in the plane tangent to the GSO arc:

   32.5-25log(θ) dBW/MHz for 2.0° ≤ θ ≤ 7°.
   11.5          dBW/MHz for 7° ≤ θ ≤ 9.2°.
   35.5-25log(θ) dBW/MHz for 9.2° ≤ θ ≤ 19.1°.
   3.5           dBW/MHz for 19.1° < θ ≤ 180°.

   where θ is as defined in paragraph (c)(1) of this section.

   (2) For co-polarized transmissions in the plane perpendicular to the
   GSO arc:

   35.5-25log(θ) dBW/MHz for 3.5° ≤ θ ≤ 7°.
   14.4          dBW/MHz for 7° < θ ≤ 9.2°.
   38.5-25log(θ) dBW/MHz for 9.2° < θ ≤ 19.1°.
   6.5           dBW/MHz for 19.1° < θ ≤ 180°.

   where θ is as defined in paragraph (c)(1) of this section.

   (3) The EIRP density levels specified in paragraphs (i)(1) and (2) of
   this section may be exceeded by up to 3 dB, for values of θ > 7°, over
   10% of the range of theta (θ) angles from 7-180° on each side of the
   line from the earth station to the target satellite.

   (4) For cross-polarized transmissions in the plane tangent to the GSO
   arc and in the plane perpendicular to the GSO arc:

   22.5-25log(θ) dBW/MHz for 2.0° < θ ≤ 7.0°.

   where θ is as defined in paragraph (c)(1) of this section.

   (5) 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 (i)(1) through (4) of this section.

   (j) Applications for authority for fixed earth station operation in the
   conventional C-band, extended C-band, conventional Ku-band, extended
   Ku-band, conventional Ka-band, or 24.75-25.25 GHz 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, as amended at  84 FR 53656 , Oct. 8, 2019;
    85 FR 44787 , July 24, 2020]

   


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Goto Year: 2020 | 2022
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