Allocations

 
U.S. Non-Federal-Government Allocations
235 - 267 MHz


U.S. Federal Government Allocations
235 - 267 MHz
FIXED
MOBILE


ITU Region 1 Allocations
235 - 267 MHz
FIXED
MOBILE


ITU Region 2 Allocations
235 - 267 MHz
FIXED
MOBILE


ITU Region 3 Allocations
235 - 267 MHz
FIXED
MOBILE


SpectrumWiki



Footnotes

5.111   The carrier frequencies 2 182 kHz, 3 023 kHz, 5 680 kHz, 8 364 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 10 003 kHz, 14 993 kHz and 19 993 kHz, but in each of these cases emissions must be confined in a band of ± 3 kHz about the frequency. (WRC 07)

5.252   Alternative allocation: in Botswana, Eswatini, Lesotho, Malawi, Mozambique, Namibia, South Africa, Zambia and Zimbabwe, the frequency bands 230-238 MHz and 246-254 MHz are allocated to the broadcasting service on a primary basis, subject to agreement obtained under No. 9.21. (WRC 19)

5.254   The bands 235-322 MHz and 335.4-399.9 MHz may be used by the mobile-satellite service, subject to agreement obtained under No. 9.21, on condition that stations in this service do not cause harmful interference to those of other services operating or planned to be operated in accordance with the Table of Frequency Allocations except for the additional allocation made in footnote No. 5.256A. (WRC-03)

5.256   The frequency 243 MHz is the frequency in this band for use by survival craft stations and equipment used for survival purposes. (WRC 07)

5.256A   Additional allocation: in China, the Russian Federation and Kazakhstan, the frequency band 258-261 MHz is also allocated to the space research service (Earth-to-space) and space operation service (Earth-to-space) on a primary basis. Stations in the space research service (Earth-to-space) and space operation service (Earth-to-space) shall not cause harmful interference to, or claim protection from, or constrain the use and development of, the mobile service systems and mobile-satellite service systems operating in the frequency band. Stations in space research service (Earth-to-space) and space operation service (Earth-to-space) shall not constrain the future development of fixed service systems of other countries. (WRC-15)

G27   In the bands 225-328.6 MHz, 335.4-399.9 MHz, and 1350-1390 MHz, the fixed and mobile services are limited to the military services.

G100   The bands 235-322 MHz and 335.4-399.9 MHz are also allocated on a primary basis to the mobile-satellite service, limited to military operations.


SpectrumWiki

 
Emergency Position Indicating Radiobeacon (EPIRB); Emergency Locator Transmitter (ELT); Personal Locating Beacon (PLB)
UHF Follow-On (UFO) Satellite Constellation
Military Mobile-Satellite Communications (NTIA)
Area Common User System (ACUS) (NTIA)
Federal Maritime Mobile Communications (NTIA)
Military Aeronautical/ATC Communications and Telemetry (NTIA)
Federal Search and Rescue Communications on 243 MHz (NTIA)
Military Battle Simulation Systems (NTIA)




Related Documents, Links, and Multimedia:
Occupancy Measurements (10)




Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 235 MHz 251 MHz 267 MHz
Wavelength 1.3 m 1.2 m 1.1 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 1,295.1 cm2 1,135.2 cm2 1,003.2 cm2
Free space loss (1 m) 19.9 dB 20.4 dB 21.0 dB
Free space loss (1 km) 79.9 dB 80.4 dB 81.0 dB
Free space loss (10 km) 99.9 dB 100.4 dB 101.0 dB
Free space loss (100 km) 119.9 dB 120.4 dB 121.0 dB
Free space loss (1000 km) 139.9 dB 140.4 dB 141.0 dB
Free space loss
(35,786 km = GEO orbit)
170.9 dB 171.5 dB 172.1 dB
Free space loss (378,370 km = Moon) 191.4 dB 192.0 dB 192.5 dB
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