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Allocations

Intro to Allocations
 
U.S. Non-Federal-Government Allocations
1660.5 - 1668.4 MHz
 RADIO ASTRONOMY US74
SPACE RESEARCH (passive)

U.S. Federal Government Allocations
1660.5 - 1668.4 MHz
 RADIO ASTRONOMY US74
SPACE RESEARCH (passive)

ITU Region 1 Allocations
1660.5 - 1668 MHz
 RADIO ASTRONOMY
SPACE RESEARCH (passive)
Fixed
Mobile except aeronautical mobile

ITU Region 2 Allocations
1660.5 - 1668 MHz
 RADIO ASTRONOMY
SPACE RESEARCH (passive)
Fixed
Mobile except aeronautical mobile

ITU Region 3 Allocations
1660.5 - 1668 MHz
 RADIO ASTRONOMY
SPACE RESEARCH (passive)
Fixed
Mobile except aeronautical mobile

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Footnotes


5.149 In making assignments to stations of other services to which the bands:

13360-13410 kHz,22.81-22.86 GHz,
25550-25670 kHz,23.07-23.12 GHz,
37.5-38.25 MHz,31.2-31.3 GHz,
73-74.6 MHz31.5-31.8 GHz
  in Regions 1 and 3,  in Regions 1 and 3,
150.05-153 MHz36.43-36.5 GHz,
  in Region 1,42.5-43.5 GHz,
322-328.6 MHz,48.94-49.04 GHz,
406.1-410 MHz,76-86 GHz,
608-614 MHz in92-94 GHz,
  Regions 1 and 3,94.1-100 GHz,
1330-1400 MHz,102-109.5 GHz,
1610.6-1613.8 MHz,111.8-114.25 GHz,
1660-1670 MHz,128.33-128.59 GHz,
1718.8-1722.2 MHz,129.23-129.49 GHz,
2655-2690 MHz,130-134 GHz,
3260-3267 MHz,136-148.5 GHz,
3332-3339 MHz,151.5-158.5 GHz,
3345.8-3352.5 MHz,168.59-168.93 GHz,
4825-4835 MHz,171.11-171.45 GHz,
4950-4990 MHz,172.31-172.65 GHz,
4990-5000 MHz,173.52-173.85 GHz,
6650-6675.2 MHz,195.75-196.15 GHz,
10.6-10.68 GHz,209-226 GHz,
14.47-14.5 GHz,241-250 GHz,
22.01-22.21 GHz,252-275 GHz
22.21-22.5 GHz,

are allocated, administrations are urged to take all practicable steps to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see Nos. 4.5 and 4.6 and Article 29). (WRC-07)

5.341 In the bands 1400-1727 MHz, 101-120 GHz and 197-220 GHz, passive research is being conducted by some countries in a programme for the search for intentional emissions of extraterrestrial origin.

5.379 Additional allocation: in Bangladesh, India, Indonesia, Nigeria and Pakistan, the band 1660.51668.4 MHz is also allocated to the meteorological aids service on a secondary basis.

5.379A Administrations are urged to give all practicable protection in the band 1660.5-1668.4 MHz for future research in radio astronomy, particularly by eliminating air-to-ground transmissions in the meteorological aids service in the band 1664.4-1668.4 MHz as soon as practicable.

US74 In the bands 25.55-25.67, 73.0-74.6, 406.1-410.0, 608-614, 1400-1427 (see US368), 1660.5-1670.0, 2690-2700, and 4990-5000 MHz, and in the bands 10.68-10.7, 15.35-15.4, 23.6-24.0, 31.3-31.5, 86-92, 100-102, 109.5-111.8, 114.25-116, 148.5-151.5, 164-167, 200-209, and 250-252 GHz, the radio astronomy service shall be protected from unwanted emissions only to the extent that such radiation exceeds the level which would be present if the offending station were operating in compliance with the technical standards or criteria applicable to the service in which it operates. Radio astronomy observations in these bands are performed at the locations listed in US385.

US246 No station shall be authorized to transmit in the following bands:

  • 73-74.6 MHz,
  • 608-614 MHz, except for medical telemetry equipment,1
  • 1400-1427 MHz,
  • 1660.5-1668.4 MHz,
  • 2690-2700 MHz,
  • 4990-5000 MHz,
  • 10.68-10.7 GHz,
  • 15.35-15.4 GHz,
  • 23.6-24 GHz,
  • 31.3-31.8 GHz,
  • 50.2-50.4 GHz,
  • 52.6-54.25 GHz,
  • 86-92 GHz,
  • 100-102 GHz,
  • 109.5-111.8 GHz,
  • 114.25-116 GHz,
  • 148.5-151.5 GHz,
  • 164-167 GHz,
  • 182-185 GHz,
  • 190-191.8 GHz,
  • 200-209 GHz,
  • 226-231.5 GHz,
  • 250-252 GHz.

1Medical telemetry equipment shall not cause harmful interference to radio astronomy operations in the band 608-614 MHz and shall be coordinated under the requirements found in 47 CFR 95.1119.


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Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 1660.5 MHz 1664.45 MHz 1668.4 MHz
Wavelength 18.1 cm 18.0 cm 18.0 cm
Band designator(s) UHF; L-band (IEEE) UHF; L-band (IEEE) UHF; L-band (IEEE)
Isotropic collecting area 25.9 cm2 25.8 cm2 25.7 cm2
Free space loss (1 m) 36.9 dB 36.9 dB 36.9 dB
Free space loss (1 km) 96.9 dB 96.9 dB 96.9 dB
Free space loss (10 km) 116.9 dB 116.9 dB 116.9 dB
Free space loss (100 km) 136.9 dB 136.9 dB 136.9 dB
Free space loss (1000 km) 156.9 dB 156.9 dB 156.9 dB
Free space loss
(35,786 km = GEO orbit) 		187.9 dB 187.9 dB 188.0 dB
Free space loss (378,370 km = Moon) 208.4 dB 208.4 dB 208.5 dB