ITU frequency specification

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written 2.8 years ago by

sourav108555 • 580

International Telecommunications Union has defined a system of terminology for electromagnetic frequencies used for radio and radar.

ITU divides the radio spectrum into 12 bands. Each band begins at a wavelength which is a power of ten (10n) metres, with corresponding frequency of 3×108−n hertz, and each covering a decade of frequency or wavelength. Each of the bands has a traditional name. For example, the term high frequency (HF) designates the wavelength range from 100 to 10 metres, corresponding to a frequency range of 3 MHz to 30 MHz. This is just a symbol and is not related to allocation, the ITU further divides each band into subbands allocated to different services. Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque, until it becomes transparent again in the near-infrared and optical window frequency ranges.

ITU Bands And It's Frequency Ranges:

ITU band number	Frequency range	ITU Band
1	3-30 Hz	ELF (Extremely Low Frequency)
2	30Hz to 300Hz	SLF (Super Low Frequency)
3	300Hz to 3000Hz	ULF (Ultra Low Frequency)
4	3kHz to 30kHz	VLF (Very Low Frequency)
5	30-300 KHz	LF (Low Frequency)
6	300KHz-3 MHz	MF (Medium Frequency)
7	3-30 MHz	HF (High Frequency
8	30-300 MHz	VHF (Very High Frequency)
9	300 MHz -3 GHz	UHF (Ultra High Frequency)
10	3-30 GHz	SHF (Super High Frequency)
11	30-300 GHz	EHF (Extremely High Frequency)
12	300–3,000 GHz	THF (Tremendously high frequency)

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