Allocations

 
U.S. Non-Federal-Government Allocations
17.97 - 18.03 MHz
AERONAUTICAL MOBILE (OR)


U.S. Federal Government Allocations
17.97 - 18.03 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 1 Allocations
17.97 - 18.03 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 2 Allocations
17.97 - 18.03 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 3 Allocations
17.97 - 18.03 MHz
AERONAUTICAL MOBILE (OR)


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Footnotes

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)


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Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 17970 kHz 18000 kHz 18030 kHz
Wavelength 16.7 m 16.7 m 16.6 m
Band designator(s) HF HF HF
Isotropic collecting area 22.1 m2 22.1 m2 22.0 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 57.5 dB 57.6 dB 57.6 dB
Free space loss (10 km) 77.5 dB 77.6 dB 77.6 dB
Free space loss (100 km) 97.5 dB 97.6 dB 97.6 dB
Free space loss (1000 km) 117.5 dB 117.6 dB 117.6 dB
Free space loss
(35,786 km = GEO orbit)
148.6 dB 148.6 dB 148.6 dB
Free space loss (378,370 km = Moon) 169.1 dB 169.1 dB 169.1 dB
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