RADIO FREQUENCY (RF) WAVE SPECTRUM
(also known as electromagnetic (em) wave spectrum
SN Type Frequency Range Wavelength Range Uses Characteristics
1 ELF Extremely Low Frequencies 30 Hz to 300 Hz 107 to 106 metre Power line (50 Hz), Low end audio �
2 VF Voice Frequencies 300 Hz to 3 KHz 106 to 105 metre Voice frequencies (telephone), audio frequencies �
3 VLF Very Low Frequencies 3 KHz to 30 KHz 105 to 104 metre Military communications, audio frequencies up to 20 KHz �
4 LF Low Frequencies 30 KHz to 300 KHz 104 to 103 metre Plane and ship communications Ground (surface) wave
5 MF Medium Frequencies 300 KHz to 3 MHz 103 to 102 metre MW AM Radio, Plane and ship communications Ground (surface) wave
6 HF High Frequencies 3 MHz to 30 MHz 102 to 10 metre SW AM Radio, Citizen Bands, Amateur Radio and CB radio Sky wave
7 VHF Very High Frequencies 30 MHz to 300 MHz 10 to 1metre FM Radio (VHF Band II - 88 MHz to 108 MHz), TV (VHF Band I and Band III), Mobile Radio, Plane and ship communications Line-of-sight (direct or space) wave
8 UHF (1GHz to 3GHz microwave) Ultra High Frequencies 300 MHz to 3 GHz 1to 10-1 metre TV (VHF Band IV, Mobile Phones �
9 SHF (microwave) Super High Frequencies 3 GHz to 30 GHz 10-1 to 10-2 metre Radar, Data Communications, Satellite communications �
10 EHF (microwave) Extremely High Frequencies 30 GHz to 300 GHz 10-2 to 10-3 metre Radar, Data Communications, Satellite communications �
11 mm (millimetre) waves 300 GHz to 3000 GHz 10-3 to 10-4 metre � �
12 IR (Infra Red) 4.3X1014 Hz 700 nm Astronomy, Weapon Guidance Systems, Remote controls �
13 Visible light (Optical spectrum) 4.3X1014 to 7.5X1014 Hz 400 to 700 nm (0.4 to 0.7 micron) Optical fibre communications �
14 UV (Ultra Violet) 7.5X1014 Hz 400 nm � �
15 X-rays � � � �
16 Gamma rays � � � �
17 Cosmic rays � � � �

10-6 m = 1 micron


Last Updated on 20 Dec 2000

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