Ranges of frequency bands and their uses.

Ranges of frequency bands and their uses.

Thursday, March 31, 2016

A frequency band is an interval in the frequency domain, delimited by a lower frequency and an upper frequency.

The frequency range of a system is the range over which it is considered to provide a useful level of signal with acceptable distortion characteristics. 
Ranges of frequency bands and their uses.
Many systems are characterized by the range of frequencies to which they respond.

A listing of the upper and lower limits of frequency limits for a system is not useful without a criterion for what the range represent.
Frequency
Range
Uses
VLF
(Very Low Frequency)
Below 30 KHz
Radio location equipment
LF
(Low Frequency)
30 to 300 KHz
Radio navigation
MF
(Medium  Frequency)
300KHz to 3 MHz
AM Radio broadcast
HF
(High Frequency)
3 MHz to 30 MHz
Radio
VHF
(Very High Frequency)
30 MHz to 300 MHz
FM broadcast and TV VHF channels
UHF
(Ultra High Frequency)
300 MHz to 3 GHz
TV UHF channels and cellular phone
SHF
(Super High Frequency)
3 GHz to 300 GHz
Satellite communication
EHF
(Extremely High Frequency)
30 GHz to 300 GHz
Satellite communication


The hertz is equivalent to cycles per second. The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.

(10)3 Hz = KHz (Kilohertz)
(10)6 Hz = MHz (Megahertz)
(10)9 Hz = GHz (Gigahertz)
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