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Technical Information

Frequencies

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[ Amateur Radio Band Plan ] [ General RadioFrequency Classification ] [ Electromagnetic Spectrum ]


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Amateur Radio Band Plan

Hambands Grayscale Image

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General Radio Frequency Classification

International Telecommunications Union (ITU) Standard
ITU Classification
Band No. Symbol Frequency range*
Source:

International Telecommunications Union (ITU),
"Recommendation ITU-R V.431-7"

Bands -1 through 2: Table 2
Bands 3 through 12: Table 1
Notes:
* Does not include the lower limit; does include the upper limit: e.g., 3 - 30 MHz extends up from above 3 MHz, but does not include 3 MHz itself, and continues to, and includes, 30 MHz.
** It is not clear from ITU-R V.431-7, Table 2 if the symbol ELF applies to all of the bands below band 3 or only to band 0.
*** Frequencies between approximately 15 Hz and 15,000 Hz (15 KHz) are typically referred to as Audio Frequencies (AF); most audio in amateur radio is below 3000 Hz (note that this refers to the frequency of the electrical wave produced by the audio, not the sound wave itself).
**** Band 2 is in some places referred to as "Super" low frequency (SLF), while bands 12 and higher are in some places referred to as "Tremendously" high frequency (THF), but not by the ITU.
Visible light is in Band 15 in the range 400 - 800 THz
-1 0.03 - 0.3 Hz
0 ELF 0.3 - 3 Hz Extremely Low Frequency
1 ** 3 - 30 Hz
2 30 - 300 Hz ***/****
3 ULF 300 - 3000 Hz Ultra Low Frequency
4 VLF 3 - 30 KHz Very Low Frequency
5 LF 30 - 300 KHz Low Frequency
6 MF 300 - 3000 KHz Medium Frequency
7 HF 3 - 30 MHz High Frequency
8 VHF 30 - 300 MHz Very High Frequency
9 UHF 300 - 3000 MHz Ultrahigh Frequency
10 SHF 3 - 30 GHz Super-High Frequency
11 EHF 30 - 300 GHz Extremely High Frequency
12 - 300 - 3000 GHz ****
13 - 3 - 30 THz
14 - 30 - 300THz
15 - 300 - 3000 THz

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Electromagnetic Spectrum

Wavelength Frequency
km Meters Hertz
1,000,000 1.00E+09 3E-01
100,000 1.00E+08 3E+00 3 Hz *
Audio Frequencies 10,000 1.00E+07 3E+01 30 Hz *
1000 1.00E+06 3E+02 300 Hz */**
Radio Frequencies 100 1.00E+05 3E+03 3 KHz 3 to 30 KHz: Very Low Frequency
meters 10 1.00E+04 3E+04 30 KHz 30 to 300 KHz: Low Frequency
1000 1 1.00E+03 3E+05 300 KHz 300 to 3000 KHz: Medium Frequency
100 1.00E+02 3E+06 3 MHz 3 to 30 MHz: High Frequency
mm cm 10 1.00E+01 3E+07 30 MHz 30 to 300 MHz: Very High Frequency
1,000 100 1 1.00E+00 3E+08 300 MHz 300 to 3000 MHz: Ultra High Frequency
C= 299,792,458 meters/second 100 10 0.1 1.00E-01 3E+09 3 GHz 3 to 30 GHz: Super High Frequency
(rounded here to 300,000,000 m/sec) um 10 1 0.01 1.00E-02 3E+10 30 GHz 30 to 300 GHz: Extremely High Frequency
1,000 1 Microwave 1.00E-03 3E+11 300 GHz 300 to 3000 GHz Tremendously High Frequency
red 620–750 nm 400–484 THz 100 0.1 1.00E-04 3E+12 3 THz
orange 590–620 nm 484–508 THz nm 10 0.01 Infrared 1.00E-05 3E+13 30 THz
yellow 570–590 nm 508–526 THz visible 1000 1 1.00E-06 3E+14 300 THz
green 570–590 nm 508–526 THz light 100 0.1 Ultraviolet 1.00E-07 3E+15 3000 THz
blue 450–495 nm 606–668 THz 10 0.01 1.00E-08 3E+16 * Frequencies between 3 Hz and 3 KHz are utilized in communications with submarines
violet 380–450 nm 668–789 THz 1 1.00E-09 3E+17
pm 0.1 X-Rays 1.00E-10 3E+18
um: micrometer E-06 10 0.01 1.00E-11 3E+19 ** Through–the–Earth (TTE) systems (used in mines) utilize frequencies between 0.3 KHz and 3 KHz
nm: nanometer E-09 1 Gamma Rays 1.00E-12 3E+20
pm: picometer E-12 0.1 1.00E-13 3E+21

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