Allocations

 
U.S. Non-Federal-Government Allocations
4.75 - 4.85 MHz
FIXED
MOBILE except aeronautical mobile (R)


U.S. Federal Government Allocations
4.75 - 4.85 MHz
FIXED
MOBILE except aeronautical mobile (R)


ITU Region 1 Allocations
4.75 - 4.85 MHz
FIXED
AERONAUTICAL MOBILE (OR)
LAND MOBILE
BROADCASTING 5.113


ITU Region 2 Allocations
4.75 - 4.85 MHz
FIXED
MOBILE except aeronautical mobile (R)
BROADCASTING 5.113


ITU Region 3 Allocations
4.75 - 4.85 MHz
FIXED
BROADCASTING 5.113
Land mobile


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Footnotes


5.113 For the conditions for the use of the bands 2300-2495 kHz (2498 kHz in Region 1), 3200-3400 kHz, 4750-4995 kHz and 5005-5060 kHz by the broadcasting service, see Nos. 5.16 to 5.20, 5.21 and 23.3 to 23.10.

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.

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Shortwave Broadcasting
Access Broadband over Power Line (Access BPL)


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4750 kHz 4800 kHz 4850 kHz
Wavelength 63.1 m 62.5 m 61.8 m
Band designator(s) HF HF HF
Isotropic collecting area 317.0 m2 310.4 m2 304.1 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 46.0 dB 46.1 dB 46.2 dB
Free space loss (10 km) 66.0 dB 66.1 dB 66.2 dB
Free space loss (100 km) 86.0 dB 86.1 dB 86.2 dB
Free space loss (1000 km) 106.0 dB 106.1 dB 106.2 dB
Free space loss
(35,786 km = GEO orbit)
137.1 dB 137.1 dB 137.2 dB
Free space loss (378,370 km = Moon) 157.5 dB 157.6 dB 157.7 dB