Allocations

 
U.S. Non-Federal-Government Allocations
4.65 - 4.7 MHz
AERONAUTICAL MOBILE (R)

FCC Rule Parts:
Aviation (87)

U.S. Federal Government Allocations
4.65 - 4.7 MHz
AERONAUTICAL MOBILE (R)


ITU Region 1 Allocations
4.65 - 4.7 MHz
AERONAUTICAL MOBILE (R)


ITU Region 2 Allocations
4.65 - 4.7 MHz
AERONAUTICAL MOBILE (R)


ITU Region 3 Allocations
4.65 - 4.7 MHz
AERONAUTICAL MOBILE (R)


SpectrumWiki


Footnotes


US282 In the band 4650-4700 kHz, frequencies may be authorized for non-Federal communication with helicopters in support of off-shore drilling operations on the condition that harmful interference will not be caused to services operating in accordance with the Table of Frequency Allocations.

US283 In the bands 2850-3025 kHz, 3400-3500 kHz, 4650-4700 kHz, 5450-5680 kHz, 6525-6685 kHz, 10005-10100 kHz, 11275-11400 kHz, 13260-13360 kHz, and 17900-17970 kHz, frequencies may be authorized for non-Federal flight test purposes on the condition that harmful interference will not be caused to services operating in accordance with the Table of Frequency Allocations.

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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Access Broadband over Power Line (Access BPL)


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4650 kHz 4675 kHz 4700 kHz
Wavelength 64.5 m 64.1 m 63.8 m
Band designator(s) HF HF HF
Isotropic collecting area 330.8 m2 327.2 m2 323.8 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 45.8 dB 45.8 dB 45.9 dB
Free space loss (10 km) 65.8 dB 65.8 dB 65.9 dB
Free space loss (100 km) 85.8 dB 85.8 dB 85.9 dB
Free space loss (1000 km) 105.8 dB 105.8 dB 105.9 dB
Free space loss
(35,786 km = GEO orbit)
136.9 dB 136.9 dB 137.0 dB
Free space loss (378,370 km = Moon) 157.4 dB 157.4 dB 157.5 dB