Allocations

 
U.S. Non-Federal-Government Allocations
24.99 - 25.01 MHz
STANDARD FREQUENCY AND TIME SIGNAL (25 MHz)


U.S. Federal Government Allocations
24.99 - 25.01 MHz
STANDARD FREQUENCY AND TIME SIGNAL (25 MHz)


ITU Region 1 Allocations
24.99 - 25.005 MHz
STANDARD FREQUENCY AND TIME SIGNAL (25 MHz)


ITU Region 2 Allocations
24.99 - 25.005 MHz
STANDARD FREQUENCY AND TIME SIGNAL (25 MHz)


ITU Region 3 Allocations
24.99 - 25.005 MHz
STANDARD FREQUENCY AND TIME SIGNAL (25 MHz)


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Footnotes

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

 
Amateur Radio 12 m Band
Access Broadband over Power Line (Access BPL)




Related Documents, Links, and Multimedia:
Band Plan (1)




Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 24990 kHz 25000 kHz 25010 kHz
Wavelength 12.0 m 12.0 m 12.0 m
Band designator(s) HF HF HF
Isotropic collecting area 11.5 m2 11.4 m2 11.4 m2
Free space loss (1 m) 0.4 dB 0.4 dB 0.4 dB
Free space loss (1 km) 60.4 dB 60.4 dB 60.4 dB
Free space loss (10 km) 80.4 dB 80.4 dB 80.4 dB
Free space loss (100 km) 100.4 dB 100.4 dB 100.4 dB
Free space loss (1000 km) 120.4 dB 120.4 dB 120.4 dB
Free space loss
(35,786 km = GEO orbit)
151.5 dB 151.5 dB 151.5 dB
Free space loss (378,370 km = Moon) 172.0 dB 172.0 dB 172.0 dB
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