Allocations

 
U.S. Non-Federal-Government Allocations
479 - 495 kHz
MARITIME MOBILE

FCC Rule Parts:
Maritime (80)

U.S. Federal Government Allocations
479 - 495 kHz
MARITIME MOBILE


ITU Region 1 Allocations
479 - 495 kHz
MARITIME MOBILE


ITU Region 2 Allocations
479 - 495 kHz
MARITIME MOBILE


ITU Region 3 Allocations
479 - 495 kHz
MARITIME MOBILE


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Footnotes


5.82   In the maritime mobile service, the frequency 490 kHz is to be used exclusively for the transmission by coast stations of navigational and meteorological warnings and urgent information to ships, by means of narrow-band direct-printing telegraphy. The conditions for use of the frequency 490 kHz are prescribed in Articles 31 and 52. In using the frequency band 415-495 kHz for the aeronautical radionavigation service, administrations are requested to ensure that no harmful interference is caused to the frequency 490 kHz. In using the frequency band 472-479 kHz for the amateur service, administrations shall ensure that no harmful interference is caused to the frequency 490 kHz. (WRC 12)



5.82C   The frequency band 495-505 kHz is used for the international NAVDAT system as described in the most recent version of Recommendation ITU-R M.2010. NAVDAT transmitting stations are limited to coast stations. (WRC 19)



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.

US231   When an assignment cannot be obtained in the bands between 200 kHz and 525 kHz, which are allocated to aeronautical radionavigation, assignments may be made to aeronautical radiobeacons in the maritime mobile bands at 435-472 kHz and 479-490 kHz, on a secondary basis, subject to the coordination and agreement of those agencies having assignments within the maritime mobile bands which may be affected. Assignments to Federal aeronautical radionavigation radiobeacons in the bands 435-472 kHz and 479-490 kHz shall not be a bar to any required changes to the maritime mobile radio service and shall be limited to non-voice emissions.

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Amateur Radio Secondary Allocation Adopted at WRC-12
Amateur Radio 630-meter Band


Related Documents, Links, and Multimedia:
FCC Proceeding (2)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 479 kHz 487 kHz 495 kHz
Wavelength 625.9 m 615.6 m 605.6 m
Band designator(s) MF MF MF
Isotropic collecting area 31,171.7 m2 30,156.0 m2 29,189.1 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 26.1 dB 26.2 dB 26.3 dB
Free space loss (10 km) 46.1 dB 46.2 dB 46.3 dB
Free space loss (100 km) 66.1 dB 66.2 dB 66.3 dB
Free space loss (1000 km) 86.1 dB 86.2 dB 86.3 dB
Free space loss
(35,786 km = GEO orbit)
117.1 dB 117.3 dB 117.4 dB
Free space loss (378,370 km = Moon) 137.6 dB 137.8 dB 137.9 dB
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