Allocations

 
U.S. Non-Federal-Government Allocations
17.8 - 18.3 GHz
FIXED


U.S. Federal Government Allocations
17.8 - 18.3 GHz
FIXED-SATELLITE (space-to-Earth) US334 G117


ITU Region 1 Allocations
17.7 - 18.1 GHz
FIXED
FIXED-SATELLITE (space-to-Earth)(Earth-to-space) 5.484A 5.516
MOBILE


ITU Region 2 Allocations
17.8 - 18.1 GHz
FIXED
FIXED-SATELLITE (space-to-Earth)(Earth-to-space) 5.484A 5.516


ITU Region 3 Allocations
17.7 - 18.1 GHz
FIXED
FIXED-SATELLITE (space-to-Earth)(Earth-to-space) 5.484A 5.516
MOBILE


SpectrumWiki


Footnotes


5.484A The use of the bands 10.95-11.2 GHz (space-to-Earth), 11.45-11.7 GHz (space-to-Earth), 11.7-12.2 GHz (space-to-Earth) in Region 2, 12.2-12.75 GHz (space-to-Earth) in Region 3, 12.5-12.75 GHz (space-to-Earth) in Region 1, 13.75-14.5 GHz (Earth-to-space), 17.8-18.6 GHz (space-to-Earth), 19.7-20.2 GHz (space-to-Earth), 27.5-28.6 GHz (Earth-to-space), 29.5-30 GHz (Earth-to-space) by a non-geostationary-satellite system in the fixed-satellite service is subject to application of the provisions of No. 9.12 for coordination with other non-geostationary-satellite systems in the fixed-satellite service. Non-geostationary-satellite systems in the fixed-satellite service shall not claim protection from geostationary-satellite networks in the fixed-satellite service operating in accordance with the Radio Regulations, irrespective of the dates of receipt by the Bureau of the complete coordination or notification information, as appropriate, for the non-geostationary-satellite systems in the fixed-satellite service and of the complete coordination or notification information, as appropriate, for the geostationary-satellite networks, and No. 5.43A does not apply. Non-geostationary-satellite systems in the fixed-satellite service in the above bands shall be operated in such a way that any unacceptable interference that may occur during their operation shall be rapidly eliminated.

5.516 The use of the band 17.3-18.1 GHz by geostationary-satellite systems in the fixed-satellite service (Earth-to-space) is limited to feeder links for the broadcasting-satellite service. The use of the band 17.3-17.8 GHz in Region 2 by systems in the fixed-satellite service (Earth-to-space) is limited to geostationary satellites. For the use of the band 17.3-17.8 GHz in Region 2 by feeder links for the broadcasting-satellite service in the band 12.2-12.7 GHz, see Article 11. The use of the bands 17.3-18.1 GHz (Earth-to-space) in Regions 1 and 3 and 17.8-18.1 GHz (Earth-to-space) in Region 2 by non-geostationary-satellite systems in the fixed-satellite service is subject to application of the provisions of No. 9.12 for coordination with other non-geostationary-satellite systems in the fixed-satellite service. Non-geostationary-satellite systems in the fixed-satellite service shall not claim protection from geostationary-satellite networks in the fixed-satellite service operating in accordance with the Radio Regulations, irrespective of the dates of receipt by the Bureau of the complete coordination or notification information, as appropriate, for the non-geostationary-satellite systems in the fixed-satellite service and of the complete coordination or notification information, as appropriate, for the geostationary-satellite networks, and No. 5.43A does not apply. Non-geostationary-satellite systems in the fixed-satellite service in the above bands shall be operated in such a way that any unacceptable interference that may occur during their operation shall be rapidly eliminated.

5.519 Additional allocation: the bands 18-18.3 GHz in Region 2 and 18.1-18.4 GHz in Regions 1 and 3 are also allocated to the meteorological-satellite service (space-to-Earth) on a primary basis. Their use is limited to geostationary satellites. (WRC-07)

US334 In the band 17.8-20.2 GHz, Federal space stations in both geostationary (GSO) and non-geostationary satellite orbits (NGSO) and associated earth stations in the fixed-satellite service (space-to-Earth) may be authorized on a primary basis. For a Federal geostationary satellite network to operate on a primary basis, the space station shall be located outside the arc, measured from east to west, 70° West longitude to 120° West longitude. Coordination between Federal fixed-satellite systems and non-Federal space and terrestrial systems operating in accordance with the United States Table of Frequency Allocations is required.

  • (a) In the sub-band 17.8-19.7 GHz, the power flux-density (pfd) at the surface of the Earth produced by emissions from a Federal GSO space station or from a Federal space station in a NGSO constellation of 50 or fewer satellites, for all conditions and for all methods of modulation, shall not exceed the following values in any 1 MHz band:

    • (1) -115 dB(W/m²) for angles of arrival above the horizontal plane (δ) between 0° and 5°,
    • (2) -115 + 0.5(δ - 5) dB(W/m²) for δ between 5° and 25°, and
    • (3) -105 dB(W/m²) for δ between 25° and 90°.

  • (b) In the sub-band 17.8-19.3 GHz, the pfd at the surface of the Earth produced by emissions from a Federal space station in an NGSO constellation of 51 or more satellites, for all conditions and for all methods of modulation, shall not exceed the following values in any 1 MHz band:

    • (1) -115 - X dB(W/m²) for δ between 0° and 5°,
    • (2) -115 - X + ((10 + X)/20)(δ - 5) dB(W/m²) for δ between 5° and 25°, and
    • (3) -105 dB(W/m²) for δ between 25° and 90°; where X is defined as a function of the number of satellites, n, in an NGSO constellation as follows:
      For n ≤ 288, X = (5/119) (n - 50) dB; and
      For n > 288, X = (1/69) (n + 402) dB.


US419 The band 18.1-18.3 GHz is also allocated to the meteorological-satellite service (space-to-Earth) on a primary basis. Its use is limited to geostationary satellites and shall be in accordance with the provisions of Article 21, Table 21-4 of the ITU Radio Regulations.

G117 In the bands 7.25-7.75 GHz, 7.9-8.4 GHz, 17.3-17.7 GHz, 17.8-21.2 GHz, 30-31 GHz, 33-36 GHz, 39.5-41 GHz, 43.5-45.5 GHz and 50.4-51.4 GHz, the Federal fixed-satellite and mobile-satellite services are limited to military systems.

SpectrumWiki

 
DISH Network
ViaSat-1 Ka-band Satellite
Hughes Network Systems EchoStar XVII (Jupiter-1)
Common Carrier Fixed Point-to-Point Microwave
Other 3 billion (03b) Networks
2019 World Radiocommunication Conference (WRC-19) Agenda Item 1.5
SkyBridge
WRC-19 Agenda Item 1.5


Related Documents, Links, and Multimedia:
Legislation (1)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 17.7 GHz 18 GHz 18.3 GHz
Wavelength 1.7 cm 1.7 cm 1.6 cm
Band designator(s) SHF; Ku-band (IEEE) SHF; K-band (IEEE) SHF; K-band (IEEE)
Isotropic collecting area 0.2 cm2 0.2 cm2 0.2 cm2
Free space loss (1 m) 57.4 dB 57.6 dB 57.6 dB
Free space loss (1 km) 117.4 dB 117.6 dB 117.6 dB
Free space loss (10 km) 137.4 dB 137.6 dB 137.6 dB
Free space loss (100 km) 157.4 dB 157.6 dB 157.6 dB
Free space loss (1000 km) 177.4 dB 177.6 dB 177.6 dB
Free space loss
(35,786 km = GEO orbit)
208.5 dB 208.6 dB 208.7 dB
Free space loss (378,370 km = Moon) 229.0 dB 229.1 dB 229.2 dB