Allocations

 
U.S. Non-Federal-Government Allocations
156.7625 - 156.8375 MHz
MARITIME MOBILE (distress, urgency, safety, and calling)

Relevant FCC Auctions:
Auction 20 (VHF Public Coast), $7,459,200
Auction 39 (VHF Public Coast and Location and Monitoring Services), $1,144,755
 Total net auction bids: $8,603,955

U.S. Federal Government Allocations
156.7625 - 156.8375 MHz
MARITIME MOBILE (distress, urgency, safety, and calling)


ITU Region 1 Allocations
156.7625 - 156.7875 MHz
MARITIME MOBILE
Mobile-satellite (Earth-to-space)


ITU Region 2 Allocations
156.7625 - 156.7875 MHz
MARITIME MOBILE
MOBILE-SATELLITE (Earth-to-space)


ITU Region 3 Allocations
156.7625 - 156.7875 MHz
MARITIME MOBILE
Mobile-satellite (Earth-to-space)


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)

5.226 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)

5.228 The use of the frequency bands 156.7625-156.7875 MHz and 156.8125-156.8375 MHz by the mobile-satellite service (Earth-to-space) is limited to the reception of automatic identification system (AIS) emissions of long-range AIS broadcast messages (Message 27, see the most recent version of Recommendation ITU-R M.1371). With the exception of AIS emissions, emissions in these frequency bands by systems operating in the maritime mobile service for communications shall not exceed 1 W. (WRC-12)

US266 Non-Federal licensees in the Public Safety Radio Pool holding a valid authorization on June 30, 1958, to operate in the frequency band 156.27-157.45 MHz or on the frequencies 161.85 MHz or 161.91 MHz may, upon proper application, continue to be authorized for such operation, including expansion of existing systems, until such time as harmful interference is caused to the operation of any authorized station other than those licensed in the Public Safety Radio Pool.


SpectrumWiki

 
History of the Beep
FCC Narrowbanding Mandate
2019 World Radiocommunication Conference (WRC-19) Agenda Item 1.9


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 156.7625 MHz 156.8 MHz 156.8375 MHz
Wavelength 1.9 m 1.9 m 1.9 m
Band designator(s) VHF VHF VHF
Isotropic collecting area 2,910.4 cm2 2,909.0 cm2 2,907.6 cm2
Free space loss (1 m) 16.4 dB 16.4 dB 16.4 dB
Free space loss (1 km) 76.4 dB 76.4 dB 76.4 dB
Free space loss (10 km) 96.4 dB 96.4 dB 96.4 dB
Free space loss (100 km) 116.4 dB 116.4 dB 116.4 dB
Free space loss (1000 km) 136.4 dB 136.4 dB 136.4 dB
Free space loss
(35,786 km = GEO orbit)
167.4 dB 167.4 dB 167.4 dB
Free space loss (378,370 km = Moon) 187.9 dB 187.9 dB 187.9 dB