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Airband
Airband or Aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation, sometimes also referred to as ''VHF'', or phonetically as ''"Victor"''. Different sections of the band are used for radionavigational aids and air traffic control.〔H. P. Westman (ed), ''Reference Data for Radio Engineers Fifth Edition'', Howard W. Sams and Co, 1968, page 1-6〕〔(【引用サイトリンク】title=Aviation Radio Bands and Frequencies )〕
In most countries a license to operate airband equipment is required and the operator is tested on competency in procedures, language and the use of the phonetic alphabet.〔〔(【引用サイトリンク】title=Radio Telephony Training Syllabus )〕
==Spectrum usage==
The VHF airband uses the frequencies between 108 and 137 MHz. The lowest 10 MHz of the band, from 108–117.95 MHz, is split into 200 narrow-band channels of 50 kHz. These are reserved for navigational aids such as VOR beacons, and precision approach systems such as ILS localizers.〔〔
, most countries divide the upper 19 MHz into 760 channels for amplitude modulation voice transmissions, on frequencies from 118–136.975 MHz, in steps of 25 kHz. In Europe, it is becoming common to further divide those channels into three (8.33 kHz channel spacing), potentially permitting 2,280 channels. Some channels between 123.100 and 135.950 are available in the US to other users such as government agencies, commercial company advisory, search and rescue, military aircraft, glider and ballooning air-to-ground, flight test and national aviation authority use. A typical transmission range of an aircraft flying at cruise altitude (), is about in good weather conditions.〔〔〔(【引用サイトリンク】title=Requirements for 760 channel VHF radio for Aeronautical operations )〕〔(【引用サイトリンク】title=VII. ELECTRONIC AIDS TO INSTRUMENT FLYING )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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