Allocations

 
U.S. Non-Federal-Government Allocations
6.685 - 6.765 MHz
AERONAUTICAL MOBILE (OR)


U.S. Federal Government Allocations
6.685 - 6.765 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 1 Allocations
6.685 - 6.765 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 2 Allocations
6.685 - 6.765 MHz
AERONAUTICAL MOBILE (OR)


ITU Region 3 Allocations
6.685 - 6.765 MHz
AERONAUTICAL MOBILE (OR)


SpectrumWiki


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.

SpectrumWiki

 
Industrial, Scientific, and Medical Devices (ISM, FCC Part 18)
Access Broadband over Power Line (Access BPL)


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 6685 kHz 6725 kHz 6765 kHz
Wavelength 44.8 m 44.6 m 44.3 m
Band designator(s) HF HF HF
Isotropic collecting area 160.0 m2 158.1 m2 156.3 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 49.0 dB 49.0 dB 49.1 dB
Free space loss (10 km) 69.0 dB 69.0 dB 69.1 dB
Free space loss (100 km) 89.0 dB 89.0 dB 89.1 dB
Free space loss (1000 km) 109.0 dB 109.0 dB 109.1 dB
Free space loss
(35,786 km = GEO orbit)
140.0 dB 140.1 dB 140.1 dB
Free space loss (378,370 km = Moon) 160.5 dB 160.6 dB 160.6 dB