Allocations

 
U.S. Non-Federal-Government Allocations
137.8 - 160 kHz
FIXED
MARITIME MOBILE

FCC Rule Parts:
Maritime (80)

U.S. Federal Government Allocations
137.8 - 160 kHz
FIXED
MARITIME MOBILE


ITU Region 1 Allocations
148.5 - 255 kHz
BROADCASTING


ITU Region 2 Allocations
137.8 - 160 kHz
FIXED
MARITIME MOBILE


ITU Region 3 Allocations
137.8 - 160 kHz
FIXED
MARITIME MOBILE
RADIONAVIGATION


SpectrumWiki

Band Uses (137.8 - 255 kHz)

Footnotes


5.64 Only classes A1A or F1B, A2C, A3C, F1C or F3C emissions are authorized for stations of the fixed service in the bands allocated to this service between 90 kHz and 160 kHz (148.5 kHz in Region 1) and for stations of the maritime mobile service in the bands allocated to this service between 110 kHz and 160 kHz (148.5 kHz in Region 1). Exceptionally, class J2B or J7B emissions are also authorized in the bands between 110 kHz and 160 kHz (148.5 kHz in Region 1) for stations of the maritime mobile service.

5.68 Alternative allocation: in Angola, Burundi, Congo (Rep. of the), Malawi, the Dem. Rep. of the Congo, Rwanda and South Africa, the band 160-200 kHz is allocated to the fixed service on a primary basis.

5.69 Additional allocation: in Somalia, the band 200-255 kHz is also allocated to the aeronautical radionavigation service on a primary basis.

5.70 Alternative allocation: in Angola, Botswana, Burundi, the Central African Rep., Congo (Rep. of the), Ethiopia, Kenya, Lesotho, Madagascar, Malawi, Mozambique, Namibia, Nigeria, Oman, the Dem. Rep. of the Congo, Rwanda, South Africa, Swaziland, Tanzania, Chad, Zambia and Zimbabwe, the band 200-283.5 kHz is allocated to the aeronautical radionavigation service on a primary basis. (WRC 07)

US2 In the band 9-490 kHz, electric utilities operate Power Line Carrier (PLC) systems on power transmission lines for communications important to the reliability and security of electric service to the public. These PLC systems operate under the provisions of 47 CFR part 15, or Chapter 8 of the NTIA Manual, on an unprotected and non-interference basis with respect to authorized radio users. Notification of intent to place new or revised radio frequency assignments or PLC frequency uses in the band 9-490 kHz is to be made in accordance with the Rules and Regulations of the FCC and NTIA, and users are urged to minimize potential interference to the extent practicable. This footnote does not provide any allocation status to PLC radio frequency uses.

SpectrumWiki

 
Aeronautical Nondirectional Radiobeacons (NDBs)
Longwave Broadcasting
Ground Wave Emergency Network (GWEN)
LowFER Band
Amateur Radio 2200-meter Band


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 137.8 kHz 196.4 kHz 255 kHz
Wavelength 2175.6 m 1526.4 m 1175.7 m
Band designator(s) LF LF LF
Isotropic collecting area 376,645.8 m2 185,416.6 m2 109,989.5 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 15.2 dB 18.3 dB 16.5 dB
Free space loss (10 km) 35.2 dB 38.3 dB 36.5 dB
Free space loss (100 km) 55.2 dB 58.3 dB 56.5 dB
Free space loss (1000 km) 75.2 dB 78.3 dB 76.5 dB
Free space loss
(35,786 km = GEO orbit)
106.3 dB 109.4 dB 107.6 dB
Free space loss (378,370 km = Moon) 126.8 dB 129.9 dB 128.1 dB