Allocations

 
U.S. Non-Federal-Government Allocations
117.975 - 121.9375 MHz
AERONAUTICAL MOBILE (R)

FCC Rule Parts:
Aviation (87)

U.S. Federal Government Allocations
117.975 - 121.9375 MHz
AERONAUTICAL MOBILE (R)


ITU Region 1 Allocations
117.975 - 137 MHz
AERONAUTICAL MOBILE (R)


ITU Region 2 Allocations
117.975 - 137 MHz
AERONAUTICAL MOBILE (R)


ITU Region 3 Allocations
117.975 - 137 MHz
AERONAUTICAL MOBILE (R)


SpectrumWiki


Footnotes


5.111 The carrier frequencies 2182 kHz, 3023 kHz, 5680 kHz, 8364 kHz and the frequencies 121.5 MHz, 156.525 MHz, 156.8 MHz and 243 MHz may also be used, in accordance with the procedures in force for terrestrial radiocommunication services, for search and rescue operations concerning manned space vehicles. The conditions for the use of the frequencies are prescribed in Article 31.

The same applies to the frequencies 10003 kHz, 14993 kHz and 19993 kHz, but in each of these cases emissions must be confined in a band of +/- 3 kHz about the frequency. (WRC-07)

5.200 In the band 117.975 137 MHz, the frequency 121.5 MHz is the aeronautical emergency frequency and, where required, the frequency 123.1 MHz is the aeronautical frequency auxiliary to 121.5 MHz. Mobile stations of the maritime mobile service may communicate on these frequencies under the conditions laid down in Article 31 for distress and safety purposes with stations of the aeronautical mobile service. (WRC-07)

5.201 Additional allocation: in Angola, Armenia, Azerbaijan, Belarus, Bulgaria, Estonia, the Russian Federation, Georgia, Hungary, Iran (Islamic Republic of), Iraq, Japan, Kazakhstan, Latvia, Moldova, Mongolia, Mozambique, Uzbekistan, Papua New Guinea, Poland, Kyrgyzstan, Slovakia, the Czech Rep., Romania, Tajikistan, Turkmenistan and Ukraine, the band 132-136 MHz is also allocated to the aeronautical mobile (OR) service on a primary basis. In assigning frequencies to stations of the aeronautical mobile (OR) service, the administration shall take account of the frequencies assigned to stations in the aeronautical mobile (R) service.

5.202 Additional allocation: in Saudi Arabia, Armenia, Azerbaijan, Belarus, Bulgaria, the United Arab Emirates, the Russian Federation, Georgia, Iran (Islamic Republic of), Jordan, Latvia, Moldova, Oman, Uzbekistan, Poland, the Syrian Arab Republic, Kyrgyzstan, Slovakia, the Czech Rep., Romania, Tajikistan, Turkmenistan and Ukraine, the band 136-137 MHz is also allocated to the aeronautical mobile (OR) service on a primary basis. In assigning frequencies to stations of the aeronautical mobile (OR) service, the administration shall take account of the frequencies assigned to stations in the aeronautical mobile (R) service.

US26 The bands 117.975-121.4125 MHz, 123.5875-128.8125 MHz and 132.0125-136.0 MHz are for air traffic control communications.

US28 The band 121.5875-121.9375 MHz is for use by aeronautical utility land and mobile stations, and for air traffic control communications.

US36 In Hawaii, the bands 120.647-120.653 MHz and 127.047-127.053 MHz are also allocated to the aeronautical mobile service on a primary basis for non-Federal aircraft air-to-air communications on 120.65 MHz (Maui) and 127.05 MHz (Hawaii and Kauai) as specified in 47 CFR 87.187.


SpectrumWiki

 
Emergency Position Indicating Radiobeacon (EPIRB); Emergency Locator Transmitter (ELT); Personal Locating Beacon (PLB)


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Occupancy Measurements (10)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 117.975 MHz 127.4875 MHz 137 MHz
Wavelength 2.5 m 2.4 m 2.2 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 5,138.7 cm2 4,400.4 cm2 3,810.6 cm2
Free space loss (1 m) 13.9 dB 14.6 dB 15.2 dB
Free space loss (1 km) 73.9 dB 74.6 dB 75.2 dB
Free space loss (10 km) 93.9 dB 94.6 dB 95.2 dB
Free space loss (100 km) 113.9 dB 114.6 dB 115.2 dB
Free space loss (1000 km) 133.9 dB 134.6 dB 135.2 dB
Free space loss
(35,786 km = GEO orbit)
165.0 dB 165.6 dB 166.3 dB
Free space loss (378,370 km = Moon) 185.4 dB 186.1 dB 186.7 dB