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2. Air-to-ground communication - Wikipedia

   en.wikipedia.org/wiki/Air-to-ground_communication

   Air-to-ground communication. The earliest communication with aircraft was by visual signalling, ground-to-air only. Air-to-ground communication was first made possible by the development of two-way aerial telegraphy in 1912, soon followed by two-way radio. By the Second World War, radio had become the chief medium of air-to-ground and air-to ...

3. Aircraft Radio Corporation - Wikipedia

   en.wikipedia.org/wiki/Aircraft_Radio_Corporation

   Aircraft Radio Corporation (ARC) – not to be confused with Aeronautical Radio, Inc. (ARINC) – was a principal pioneer and major manufacturer of avionics for military and commercial aircraft, and later general aviation (light) aircraft, from the 1920s to the 1950s—subsequently acquired and rebranded by a succession of other companies, each of whom changed the official name, of the ...

4. Airband - Wikipedia

   en.wikipedia.org/wiki/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. [1] [2] [3]

5. Low-frequency radio range - Wikipedia

   en.wikipedia.org/wiki/Low-frequency_radio_range

   The low-frequency radio range, also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly " the range ", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF omnidirectional range (VOR), beginning in the late ...

6. ACARS - Wikipedia

   en.wikipedia.org/wiki/ACARS

   In aviation, ACARS ( / ˈeɪkɑːrz /; an acronym for Aircraft Communications Addressing and Reporting System) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The protocol was designed by ARINC and deployed in 1978, [1] using the Telex format.

7. Radio beacon - Wikipedia

   en.wikipedia.org/wiki/Radio_beacon

   In navigation, a radio beacon or radiobeacon is a kind of beacon, a device that marks a fixed location and allows direction-finding equipment to find relative bearing. But instead of employing visible light, radio beacons transmit electromagnetic radiation in the radio wave band. They are used for direction-finding systems on ships, aircraft ...