Allocations

 
U.S. Non-Federal-Government Allocations
4 - 4.063 MHz
FIXED
MARITIME MOBILE

FCC Rule Parts:
Maritime (80)

U.S. Federal Government Allocations
4 - 4.063 MHz
FIXED
MARITIME MOBILE


ITU Region 1 Allocations
4 - 4.063 MHz
FIXED
MARITIME MOBILE 5.127


ITU Region 2 Allocations
4 - 4.063 MHz
FIXED
MARITIME MOBILE 5.127


ITU Region 3 Allocations
4 - 4.063 MHz
FIXED
MARITIME MOBILE 5.127


SpectrumWiki


Footnotes


5.126 In Region 3, the stations of those services to which the band 3995-4005 kHz is allocated may transmit standard frequency and time signals.

5.127 The use of the band 4000-4063 kHz by the maritime mobile service is limited to ship stations using radiotelephony (see No. 52.220 and Appendix 17).

US340 The band 2-30 MHz is available on a non-interference basis to Federal and non-Federal maritime and aeronautical stations for the purposes of measuring the quality of reception on radio channels. See 47 CFR 87.149 for the list of protected frequencies and bands within this frequency range. Actual communications shall be limited to those frequencies specifically allocated to the maritime mobile and aeronautical mobile services.

SpectrumWiki

 
Amateur Radio 80 m Band
Shortwave Broadcasting
Access Broadband over Power Line (Access BPL)


Related Documents, Links, and Multimedia:
FCC Proceeding (8)
Band Plan (2)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4000 kHz 4031.5 kHz 4063 kHz
Wavelength 74.9 m 74.4 m 73.8 m
Band designator(s) HF HF HF
Isotropic collecting area 447.0 m2 440.0 m2 433.2 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 44.5 dB 44.6 dB 44.6 dB
Free space loss (10 km) 64.5 dB 64.6 dB 64.6 dB
Free space loss (100 km) 84.5 dB 84.6 dB 84.6 dB
Free space loss (1000 km) 104.5 dB 104.6 dB 104.6 dB
Free space loss
(35,786 km = GEO orbit)
135.6 dB 135.6 dB 135.7 dB
Free space loss (378,370 km = Moon) 156.0 dB 156.1 dB 156.2 dB