Spectrum
Spectrum is the distribution of wavelengths and frequencies.
In scanning and radio frequency uses, we often refer to a bandwidth of spectrum as a "band". These "bands" are frequencies that exist in a continuous range and usually have a common characteristic which identify it as a type of band.
These bands are divided by the area of the spectrum in which they are located. Those "bands" are commonly accepted to conform to the following table:
Spectrum Table
| Abbreviation
| Name
| Frequency
| Wavelength
|
| ELF | Extremely Low Frequency | < 3 kHz | > 100 km
|
| VLF | Very Low Frequency | 3 kHz - 30 kHz | 100 km - 10 km
|
| LF | Low Frequency | 30 kHz - 300 kHz | 10 km - 1000 m
|
| MF | Medium Frequency | 300 kHz - 3 MHz | 1000 m - 100 m
|
| HF | High Frequency | 3 MHz - 30 MHz | 100 m - 10 m
|
| VHF | Very High Frequency | 30 MHz - 300 MHz | 10 m - 1 m
|
| UHF | Ultra High Frequency | 300 MHz - 3 GHz | 1 m - 10 cm
|
| SHF | Super High Frequency | 3 GHz - 30 GHz | 10 cm - 1 cm
|
| EHF | Extremely High Frequency | 30 GHz - 300 GHz | 1 cm - 1 mm
|
The National Telecommunications and Information Administration (NTIA) Office of Spectrum Management (OSM) publishes the United States Frequency Allocation Chart which shows radio spectrum use in the US.
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