Allocations

 
U.S. Non-Federal-Government Allocations
137.825 - 138 MHz


U.S. Federal Government Allocations
137.825 - 138 MHz
FIXED
MOBILE


ITU Region 1 Allocations
137.825 - 138 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 2 Allocations
137.825 - 138 MHz
FIXED
MOBILE
RADIOLOCATION
Space research (space-to-Earth)


ITU Region 3 Allocations
137.825 - 138 MHz
FIXED
MOBILE
Space research (space-to-Earth)


SpectrumWiki


Footnotes


5.204 Different category of service: in Afghanistan, Saudi Arabia, Bahrain, Bangladesh, Brunei Darussalam, China, Cuba, the United Arab Emirates, India, Indonesia, Iran (Islamic Republic of), Iraq, Kuwait, Montenegro, Oman, Pakistan, the Philippines, Qatar, Serbia, Singapore, Thailand and Yemen, the band 137-138 MHz is allocated to the fixed and mobile, except aeronautical mobile (R), services on a primary basis (see No. 5.33). (WRC-07)

5.205 Different category of service: in Israel and Jordan, the allocation of the band 137-138 MHz to the fixed and mobile, except aeronautical mobile, services is on a primary basis (see No. 5.33).

5.206 Different category of service: in Armenia, Azerbaijan, Belarus, Bulgaria, Egypt, the Russian Federation, Finland, France, Georgia, Greece, Kazakhstan, Lebanon, Moldova, Mongolia, Uzbekistan, Poland, Kyrgyzstan, the Syrian Arab Republic, Slovakia, the Czech Rep., Romania, Tajikistan, Turkmenistan and Ukraine, the allocation of the band 137-138 MHz to the aeronautical mobile (OR) service is on a primary basis (see No. 5.33).

5.207 Additional allocation: in Australia, the band 137-144 MHz is also allocated to the broadcasting service on a primary basis until that service can be accommodated within regional broadcasting allocations.

5.208 The use of the band 137-138 MHz by the mobile-satellite service is subject to coordination under No. 9.11A.

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Orbcomm LEO Satellite Constellation


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Occupancy Measurements (10)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 137.825 MHz 137.9125 MHz 138 MHz
Wavelength 2.2 m 2.2 m 2.2 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 3,765.1 cm2 3,760.3 cm2 3,755.5 cm2
Free space loss (1 m) 15.2 dB 15.2 dB 15.2 dB
Free space loss (1 km) 75.2 dB 75.2 dB 75.2 dB
Free space loss (10 km) 95.2 dB 95.2 dB 95.2 dB
Free space loss (100 km) 115.2 dB 115.2 dB 115.2 dB
Free space loss (1000 km) 135.2 dB 135.2 dB 135.2 dB
Free space loss
(35,786 km = GEO orbit)
166.3 dB 166.3 dB 166.3 dB
Free space loss (378,370 km = Moon) 186.8 dB 186.8 dB 186.8 dB