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Difference between revisions of "Spectrum"

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Spectrum is the distribution of wavelengths and frequencies.   
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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:
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{| 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
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! style="background:#efefef;" | Spectrum
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! style="background:#efefef;" | Frequency
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! style="background:#efefef;" | Wavelength
 
|-
 
|-
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| ELF || Extremely Low Frequency || < 3 [[kHz]]
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| ELF || Extremely Low Frequency || < 3 kHz || > 100 km
 
|-
 
|-
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| VLF || Very Low Frequency || 3 - 30 [[kHz]]
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| VLF || Very Low Frequency || 3 kHz - 30 kHz || 100 km - 10 km
 
|-
 
|-
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| LF || Low Frequency || 30 - 300 [[kHz]]
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| LF || Low Frequency || 30 kHz - 300 kHz || 10 km - 1000 m
 
|-
 
|-
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| MF || Medium Frequency || 300 [[kHz]] - 3 [[MHz]]
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| MF || Medium Frequency || 300 kHz - 3 [[MHz]] || 1000 m - 100 m
 
|-
 
|-
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| HF || High Frequency || 3 - 30 [[MHz]]
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| HF || High Frequency || 3 MHz - 30 MHz || 100 m - 10 m
 
|-
 
|-
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| VHF || Very High Frequency || 30 - 300 [[MHz]]
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| VHF || Very High Frequency || 30 MHz - 300 MHz || 10 m - 1 m
 
|-
 
|-
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| UHF || Ultra High Frequency || 300 [[MHz]] - 3 [[GHz]]
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| UHF || Ultra High Frequency || 300 MHz - 3 [[GHz]] || 1 m - 10 cm
 
|-
 
|-
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| SHF || Super High Frequency || 3 - 30 [[GHz]]
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| SHF || Super High Frequency || 3 GHz - 30 GHz || 10 cm - 1 cm
 
|-
 
|-
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| EHF || Extremely High Frequency || 30 - 300 [[GHz]]
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| 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:

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
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