Allocations

 
U.S. Non-Federal-Government Allocations
19.99 - 20.01 MHz
STANDARD FREQUENCY AND TIME SIGNAL (20 MHz)


U.S. Federal Government Allocations
19.99 - 20.01 MHz
STANDARD FREQUENCY AND TIME SIGNAL (20 MHz)


ITU Region 1 Allocations
19.99 - 19.995 MHz
STANDARD FREQUENCY AND TIME SIGNAL
Space research


ITU Region 2 Allocations
19.99 - 19.995 MHz
STANDARD FREQUENCY AND TIME SIGNAL
Space research


ITU Region 3 Allocations
19.99 - 19.995 MHz
STANDARD FREQUENCY AND TIME SIGNAL
Space research


SpectrumWiki

Band Uses (19990 - 20010 kHz)

Footnotes

5.111   The carrier frequencies 2 182 kHz, 3 023 kHz, 5 680 kHz, 8 364 kHz and the frequencies 121.5 MHz, 156.525 MHz, 156.8 MHz and 243 MHz may also be used, in accordance with the procedures in force for terrestrial radiocommunication services, for search and rescue operations concerning manned space vehicles. The conditions for the use of the frequencies are prescribed in Article 31.
    The same applies to the frequencies 10 003 kHz, 14 993 kHz and 19 993 kHz, but in each of these cases emissions must be confined in a band of ± 3 kHz about the frequency. (WRC 07)

US1   The bands 2501-2502 kHz, 5003-5005 kHz, 10 003-10 005 kHz, 15 005-15 010 kHz, 19 990-19 995 kHz, 20 005-20 010 kHz, and 25 005-25 010 kHz are also allocated to the space research service on a secondary basis for Federal use. In the event of interference to the reception of the standard frequency and time broadcasts, these space research transmissions are subject to immediate temporary or permanent shutdown.

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

 
Access Broadband over Power Line (Access BPL)


Related Documents, Links, and Multimedia:

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 19990 kHz 20000 kHz 20010 kHz
Wavelength 15.0 m 15.0 m 15.0 m
Band designator(s) HF HF HF
Isotropic collecting area 17.9 m2 17.9 m2 17.9 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 58.5 dB 58.5 dB 58.5 dB
Free space loss (10 km) 78.5 dB 78.5 dB 78.5 dB
Free space loss (100 km) 98.5 dB 98.5 dB 98.5 dB
Free space loss (1000 km) 118.5 dB 118.5 dB 118.5 dB
Free space loss
(35,786 km = GEO orbit)
149.5 dB 149.5 dB 149.5 dB
Free space loss (378,370 km = Moon) 170.0 dB 170.0 dB 170.0 dB
Simple HTML Table