English communication syllabus pdf

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This article is about the radio spectrum used in aviation. A typical aircraft VHF radio. The display shows an active frequency of 123.

5 MHz and a standby frequency of 121. The two are exchanged using the button marked with a double-headed arrow.

The tuning control on the right only affects the standby frequency. 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.

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. The VHF airband uses the frequencies between 108 and 137 MHz.

These are reserved for navigational aids such as VOR beacons, and precision approach systems such as ILS localizers. 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.

Aeronautical voice communication is also conducted in other frequency bands, including satellite voice on Inmarsat or Iridium, and high frequency voice. Usually these other frequency bands are only used in oceanic and remote areas, though they work over wider areas or even globally.

Military aircraft also use a dedicated UHF-AM band from 225. 95 MHz for air-to-air and air-to-ground, including air traffic control communication. This band has a designated emergency and guard channel of 243. UHF frequency range of 329.

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