Allocations

 
U.S. Non-Federal-Government Allocations
173.4 - 174 MHz


U.S. Federal Government Allocations
173.4 - 174 MHz
FIXED
MOBILE

G5

ITU Region 1 Allocations
162.0375 - 174 MHz
FIXED
MOBILE except aeronautical mobile


ITU Region 2 Allocations
162.0375 - 174 MHz
FIXED
MOBILE


ITU Region 3 Allocations
162.0375 - 174 MHz
FIXED
MOBILE


SpectrumWiki


Footnotes


5.226 The frequency 156.525 MHz is the international distress, safety and calling frequency for the maritime mobile VHF radiotelephone service using digital selective calling (DSC). The conditions for the use of this frequency and the band 156.4875-156.5625 MHz are contained in Articles 31 and 52, and in Appendix 18.

The frequency 156.8 MHz is the international distress, safety and calling frequency for the maritime mobile VHF radiotelephone service. The conditions for the use of this frequency and the band 156.7625-156.8375 MHz are contained in Article 31 and Appendix 18.

In the bands 156-156.4875 MHz, 156.5625-156.7625 MHz, 156.8375-157.45 MHz, 160.6-160.975 MHz and 161.475-162.05 MHz, each administration shall give priority to the maritime mobile service on only such frequencies as are assigned to stations of the maritime mobile service by the administration (see Articles 31 and 52, and Appendix 18).

Any use of frequencies in these bands by stations of other services to which they are allocated should be avoided in areas where such use might cause harmful interference to the maritime mobile VHF radiocommunication service.

However, the frequencies 156.8 MHz and 156.525 MHz and the frequency bands in which priority is given to the maritime mobile service may be used for radiocommunications on inland waterways subject to agreement between interested and affected administrations and taking into account current frequency usage and existing agreements. (WRC-07)

5.229 Alternative allocation: in Morocco, the band 162-174 MHz is allocated to the broadcasting service on a primary basis. The use of this band shall be subject to agreement with administrations having services, operating or planned, in accordance with the Table which are likely to be affected. Stations in existence on 1 January 1981, with their technical characteristics as of that date, are not affected by such agreement.

5.230 Additional allocation: in China, the band 163-167 MHz is also allocated to the space operation service (space-to-Earth) on a primary basis, subject to agreement obtained under No. 9.21.

5.231 Additional allocation: in Afghanistan and China, the band 167-174 MHz is also allocated to the broadcasting service on a primary basis. The introduction of the broadcasting service into this band shall be subject to agreement with the neighbouring countries in Region 3 whose services are likely to be affected. (WRC-12)

5.232 Additional allocation: in Japan, the band 170-174 MHz is also allocated to the broadcasting service on a primary basis.

G5 In the bands 162.0125-173.2, 173.4-174, 406.1-410 and 410-420 MHz, use by the military services is limited by the provisions specified in the channeling plans shown in Sections 4.3.7 and 4.3.9 of the NTIA Manual.


SpectrumWiki

 
NOAA Weather Radio
Television Broadcast
LoJack Stolen Vehicle Recovery System
FCC Narrowbanding Mandate
2019 World Radiocommunication Conference (WRC-19) Agenda Item 1.9
Television Band “White Space” Devices


Related Documents, Links, and Multimedia:
FCC Proceeding (3)
Occupancy Measurements (10)
Legislation (1)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 162.0375 MHz 168.01875 MHz 174 MHz
Wavelength 1.9 m 1.8 m 1.7 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 2,724.0 cm2 2,533.5 cm2 2,362.3 cm2
Free space loss (1 m) 16.6 dB 17.0 dB 17.3 dB
Free space loss (1 km) 76.6 dB 77.0 dB 77.3 dB
Free space loss (10 km) 96.6 dB 97.0 dB 97.3 dB
Free space loss (100 km) 116.6 dB 117.0 dB 117.3 dB
Free space loss (1000 km) 136.6 dB 137.0 dB 137.3 dB
Free space loss
(35,786 km = GEO orbit)
167.7 dB 168.0 dB 168.3 dB
Free space loss (378,370 km = Moon) 188.2 dB 188.5 dB 188.8 dB