Allocations

 
U.S. Non-Federal-Government Allocations
9.995 - 10.005 MHz
STANDARD FREQUENCY AND TIME SIGNAL (10 MHz)


U.S. Federal Government Allocations
9.995 - 10.005 MHz
STANDARD FREQUENCY AND TIME SIGNAL (10 MHz)


ITU Region 1 Allocations
9.995 - 10.003 MHz
STANDARD FREQUENCY AND TIME SIGNAL (10 MHz)


ITU Region 2 Allocations
9.995 - 10.003 MHz
STANDARD FREQUENCY AND TIME SIGNAL (10 MHz)


ITU Region 3 Allocations
9.995 - 10.003 MHz
STANDARD FREQUENCY AND TIME SIGNAL (10 MHz)


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Footnotes


5.111 The carrier frequencies 2182 kHz, 3023 kHz, 5680 kHz, 8364 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 10003 kHz, 14993 kHz and 19993 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, 10003-10005 kHz, 15005-15010 kHz, 19990-19995 kHz, 20005-20010 kHz, and 25005-25010 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.


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Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 9995 kHz 10000 kHz 10005 kHz
Wavelength 30.0 m 30.0 m 30.0 m
Band designator(s) HF HF HF
Isotropic collecting area 71.6 m2 71.5 m2 71.4 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 52.4 dB 52.5 dB 52.5 dB
Free space loss (10 km) 72.4 dB 72.5 dB 72.5 dB
Free space loss (100 km) 92.4 dB 92.5 dB 92.5 dB
Free space loss (1000 km) 112.4 dB 112.5 dB 112.5 dB
Free space loss
(35,786 km = GEO orbit)
143.5 dB 143.5 dB 143.5 dB
Free space loss (378,370 km = Moon) 164.0 dB 164.0 dB 164.0 dB