47 CFR 25.218 - Off-axis EIRP envelopes for FSS earth station operations.

Status message

There are 9 Updates appearing in the Federal Register for 47 CFR 25. View below or at eCFR (GPOAccess)
§ 25.218 Off-axis EIRP envelopes for FSS earth station operations.
(a) This section applies to all earth station applications, except for:
(1) ESV and VMES applications,
(2) Analog video earth station applications,
(3) Applications for feeder-link earth stations in the 17/24 GHz BSS.
(b) Earth station applications subject to this section are eligible for routine processing if they meet the applicable off-axis EIRP envelope set forth in this section below. For purposes of this section, the term “extended Ku-band” is the 10.7 through 11.7 GHz, 12.75 through 13.25 GHz, and 13.75 through 14.0 GHz band. The term “conventional Ku-band” is defined in § 25.201 of this chapter.
(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:
29.5-25log10θ 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 the line connecting the focal point of the antenna to the target satellite, and the geostationary orbit plane is determined by the focal point of the antenna and the line tangent to the arc of the geostationary satellite orbit at the position of the target satellite. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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:
32.5-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−9.5 dBW/4 kHz For 48° < θ ≤ 180°
where θ is the angle in degrees from the line connecting the focal point of the antenna to the target satellite, within any plane that includes that line, with the exception of the plane determined by the focal point of the antenna and the line tangent to the arc of the geostationary satellite orbit at the position of the target satellite. 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 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.
(d) C-band digital earth station operations.
(1) In the plane of the geostationary satellite orbit as it appears at the particular earth station location:
26.3-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤ θ ≤ 7°
5.3-10log10(N) dBW/4 kHz For 7° < θ ≤ 9.2°
29.3 -10log10(N)-25log10θ dBW/4 kHz For 9.2° < θ ≤ 48°
−12.7-10log10(N) dBW/4 kHz For 48° < θ ≤ 180°
where θ and the plane of the geostationary satellite orbit are defined in paragraph (c)(1) of this section, and N is defined below. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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)-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−12.7-10log10(N) dBW/4 kHz For 48° < θ ≤ 180°
where θ is defined in paragraph (c)(2) of this section, and N is defined in paragraph (d)(1) of this section. 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 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.
(e) Conventional Ku-band analog earth station operations.
(1) In the plane of the geostationary satellite orbit as it appears at the particular earth station location:
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 ≤ 85°
−8 dBW/4 kHz For 85° < θ ≤ 180°
where θ and the plane of the geostationary satellite are defined in paragraph (c)(1) of this section. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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:
24-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−18 dBW/4 kHz For 48° < θ ≤ 85°
−8 dBW/4 kHz For 85° < θ ≤ 180°
where θ is defined in paragraph (c)(2) of this section. 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 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.
(f) Conventional Ku-band digital earth station operations.
(1) In the plane of the geostationary satellite orbit as it appears at the particular earth station location:
15-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤ θ ≤ 7°
−6-10log10(N) dBW/4 kHz For 7° < θ ≤ 9.2°
18-10log10(N)-25log10θ dBW/4 kHz For 9.2° < θ ≤ 48°
−24-10log10(N) dBW/4 kHz For 48° < θ ≤ 85°
−14-10log10(N) dBW/4 kHz For 85° < θ ≤ 180°
where θ and the plane of the geostationary satellite orbit are defined in paragraph (c)(1) of this section, and N is defined below. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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)-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−24-10log10(N) dBW/4 kHz For 48° < θ ≤ 85°
−14-10log10(N) dBW/4 kHz For 85° < θ ≤ 180°
where θ is defined in paragraph (c)(2) of this section, and N is defined in paragraph (f)(1) of this section. 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 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.
(g) Extended Ku-band analog earth station operations.
(1) In the plane of the geostationary satellite orbit as it appears at the particular earth station location:
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 and the plane of the geostationary satellite orbit are defined in paragraph (c)(1) of this section. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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:
24-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−18 dBW/4 kHz For 48° < θ ≤ 180°
where θ is defined in paragraph (c)(2) of this section. 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 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.
(h) Extended Ku-band digital earth station operations.
(1) In the plane of the geostationary satellite orbit as it appears at the particular earth station location:
15-10log10(N)-25log10θ dBW/4 kHz For 1.5° ≤ θ ≤ 7°
−6-10log10(N) dBW/4 kHz For 7° < θ ≤ 9.2°
18-10log10(N)-25log10θ dBW/4 kHz For 9.2° < θ ≤ 48°
−24-10log10(N) dBW/4 kHz For 48° < θ ≤ 180°
where θ and the plane of the geostationary satellite orbit are defined in paragraph (c)(1) of this section, and N is defined below. For the purposes of this section, the peak EIRP of an individual sidelobe may not exceed the envelope defined above for θ between 1.5° and 7.0°. For θ greater than 7.0°, 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)-25log10θ dBW/4 kHz For 3° ≤ θ ≤ 48°
−24-10log10(N) dBW/4 kHz For 48° < θ ≤ 85°
where θ is defined in paragraph (c)(2) of this section and N is defined in paragraph (h)(1) of this section. 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 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.
[73 FR 70902, Nov. 24, 2008, as amended at 74 FR 57099, Nov. 4, 2009]
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 three years.

Title 47 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 47.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-09-03; vol. 79 # 170 - Wednesday, September 3, 2014
    1. 79 FR 52224 - Rules Governing the Licensing of, and Spectrum Usage by, Commercial Earth Stations and Space Stations
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Final rule; announcement of effective date.
      47 CFR 25.170, 25.171, 25.172, 25.173, 25.285, 25.286, and 25.287, and the amendments to 47 CFR 25.103, 25.111, 25.112, 25.113, 25.114, 25.115, 25.118, 25.121, 25.129, 25.130, 25.131, 25.132, 25.133, 25.134, 25.135, 25.136, 25.138, 25.140, 25.142, 25.143, 25.144, 25.145, 25.146, 25.153, 25.154, 25.161, 25.164, 25.201, 25.202, 25.203, 25.204, 25.206, 25.208, 25.209, 25.210, 25.211, 25.212, 25.214, 25.215, 25.217, 25.218, 25.220, 25.221, 25.222, 25.223, 25.226, 25.227, 25.259, 25.260, 25.271, 25.272, 25.276, and 25.281 published February 12, 2014 (79 FR 8308) are effective September 3, 2014. The incorporation by reference of certain publications listed in 47 CFR 25.281 is approved by the Director of the Federal Register as of September 3, 2014.
      47 CFR Part 25

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code

Title 47 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 47 CFR 25 after this date.

  • 2014-12-03; vol. 79 # 232 - Wednesday, December 3, 2014
    1. 79 FR 71714 - Comprehensive Review of Licensing and Operating Rules for Satellite Services
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Proposed rule; extension of comment and reply comment period.
      Comments must be received on or before January 29, 2015. Reply comments must be received on or before March 2, 2015.
      47 CFR Part 25