Difference between revisions of "Spectrum"
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− | Spectrum is the distribution of wavelengths and frequencies. | + | Spectrum is the distribution of [[wavelength|wavelengths]] and [[frequency|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. | 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: | 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: | ||
+ | |||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
|+'''Spectrum Table''' | |+'''Spectrum Table''' | ||
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! style="background:#efefef;" | Abbreviation | ! style="background:#efefef;" | Abbreviation | ||
! style="background:#efefef;" | Name | ! style="background:#efefef;" | Name | ||
− | ! style="background:#efefef;" | | + | ! style="background:#efefef;" | Frequency |
+ | ! style="background:#efefef;" | Wavelength | ||
|- | |- | ||
− | | ELF || Extremely Low Frequency || < 3 | + | | ELF || Extremely Low Frequency || < 3 kHz || > 100 km |
|- | |- | ||
− | | VLF || Very Low Frequency || 3 - 30 | + | | VLF || Very Low Frequency || 3 kHz - 30 kHz || 100 km - 10 km |
|- | |- | ||
− | | LF || Low Frequency || 30 - 300 | + | | LF || Low Frequency || 30 kHz - 300 kHz || 10 km - 1000 m |
|- | |- | ||
− | | MF || Medium Frequency || 300 | + | | MF || Medium Frequency || 300 kHz - 3 [[MHz]] || 1000 m - 100 m |
|- | |- | ||
− | | HF || High Frequency || 3 - 30 | + | | HF || High Frequency || 3 MHz - 30 MHz || 100 m - 10 m |
|- | |- | ||
− | | VHF || Very High Frequency || 30 - 300 | + | | VHF || Very High Frequency || 30 MHz - 300 MHz || 10 m - 1 m |
|- | |- | ||
− | | UHF || Ultra High Frequency || 300 | + | | UHF || Ultra High Frequency || 300 MHz - 3 [[GHz]] || 1 m - 10 cm |
|- | |- | ||
− | | SHF || Super High Frequency || 3 - 30 | + | | SHF || Super High Frequency || 3 GHz - 30 GHz || 10 cm - 1 cm |
|- | |- | ||
− | | EHF || Extremely High Frequency || 30 - 300 | + | | EHF || Extremely High Frequency || 30 GHz - 300 GHz || 1 cm - 1 mm |
|} | |} |
Revision as of 20:50, 3 March 2006
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:
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 |