Allocations

 
U.S. Non-Federal-Government Allocations
4.488 - 4.65 MHz
FIXED
MOBILE except aeronautical mobile (R)


U.S. Federal Government Allocations
4.488 - 4.65 MHz
FIXED
MOBILE except aeronautical mobile (R)


ITU Region 1 Allocations
4.488 - 4.65 MHz
FIXED
MOBILE except aeronautical mobile (R)


ITU Region 2 Allocations
4.488 - 4.65 MHz
FIXED
MOBILE except aeronautical mobile (R)


ITU Region 3 Allocations
4.488 - 4.65 MHz
FIXED
MOBILE except aeronautical mobile


SpectrumWiki



Footnotes

US22   The following provisions shall apply to non-Federal use of 68 carrier frequencies in the range 2-8 MHz, which are not coordinated with NTIA:

    (a) The frequencies authorized pursuant to 47 CFR 90.264 (Disaster Communications) and 47 CFR 90.266 (Long Distance Communications) are listed in columns 1-2 and columns 3-5, respectively. All stations are restricted to emission designator 2K80J3E, upper sideband transmissions, a maximum transmitter output power of 1 kW PEP, and to the class of station(s) listed in the column heading (i.e., fixed (FX) for all frequencies; base and mobile (FB and ML) for the frequencies in column 1 and 3; itinerant FX for the frequencies in columns 4-5).

    (b) Use, Geographic, and Time Restrictions. Letter(s) to the right of a frequency indicate that the frequency is available only for the following purpose(s):

– A or I: Alternate channel or Interstate coordination.

– C, E, M, or W: For stations located in the Conterminous U.S., East of 108° West Longitude (WL), West of the Mississippi River, or West of 90° WL.

– D or N: From two hours after local sunrise until two hours before local sunset (i.e., Day only operations) or from two hours prior to local sunset until two hours after local sunrise (i.e., Night only operations).

Preferred Carrier Frequencies (kHz)
Disaster CommunicationsLong Distance Communications
FX, FB, MLFXFX, FB, MLFX (including itinerant)
2326…I
2411
2414
2419
2422
2439
2463
2466
2471
2474
2487
2511
2535
2569
2587
2801
2804…A
2812
5135…A
5140…A, I
5192…I
5195…I
7477…A
7480…A
7802…D
7805…I
7932
7935…C, D
2289
2292
2395
2398
3170
4538.6…N
4548.6…N
4575
4610.5
4613.5
4634.5
4637.5
4647
5046.6…E
5052.6…E
5055.6…E
5061.6…W
5067.6
5074.6…E
5099.1
5102.1
5313.6
6800.1…N
6803.1
6806.1…W
6855.1…N, M
6858.1…N
6861.1…W
6885.1…N
6888.1…N
7480.1
7483.1
7486.1…E
7549.1…D
7552.1
7555.1…W
7558.1…W
7559.1…W
7562.1…W
7697.1

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

 
Ocean Radar (WRC-2012)
Access Broadband over Power Line (Access BPL)




Related Documents, Links, and Multimedia:
FCC Proceeding (1)




Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4488 kHz 4569 kHz 4650 kHz
Wavelength 66.8 m 65.6 m 64.5 m
Band designator(s) HF HF HF
Isotropic collecting area 355.1 m2 342.6 m2 330.8 m2
Free space loss (1 m) N/A (near field) N/A (near field) N/A (near field)
Free space loss (1 km) 45.5 dB 45.6 dB 45.8 dB
Free space loss (10 km) 65.5 dB 65.6 dB 65.8 dB
Free space loss (100 km) 85.5 dB 85.6 dB 85.8 dB
Free space loss (1000 km) 105.5 dB 105.6 dB 105.8 dB
Free space loss
(35,786 km = GEO orbit)
136.6 dB 136.7 dB 136.9 dB
Free space loss (378,370 km = Moon) 157.0 dB 157.2 dB 157.4 dB
Simple HTML Table