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Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).
Radio amateurs have experimented with ITA-5 (7-bit ASCII) alphabet transmissions at 110 baud – 170 Hz. NATO military services use 75 or 100 baud – 850 Hz. A few naval stations still use RTTY without encryption for CARB (channel availability broadcasts). [18] Commercial, diplomatic and weather services prefer 50 baud – 425 or 450 Hz. [19]
Cuban numbers station HM01 A recording of The Gong numbers station, run by the National People's Army of the German Democratic Republic, from 1988.. A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are believed to be addressed to intelligence officers operating in foreign countries. [1]
Code talkers transmitted messages over military telephone or radio communications nets using formally or informally developed codes built upon their Indigenous languages. The code talkers improved the speed of encryption and decryption of communications in front line operations during World War II and are credited with some decisive victories.
Former IATA code: QA; former ICAO code: AEK; former callsign: AFRICAN EXPRESS AK AXM AirAsia: RED CAP Malaysia ICAO code no longer allocated D7 XAX AirAsia X: XANADU Malaysia DJ WAJ AirAsia Japan: WING ASIA Japan defunct I5 IAD AirAsia India: ARIYA India Founded 28. Mar 2013: AXN Alexandair: ALEXANDROS Greece defunct AXP Aeromax: AEROMAX SPAIN ...
Procedure words (abbreviated to prowords) are words or phrases limited to radiotelephony procedure used to facilitate communication by conveying information in a condensed standard verbal format. [1]
Morse code mnemonics are systems to represent the sound of Morse characters in a way intended to be easy to remember. Since every one of these mnemonics requires a two-step mental translation between sound and character, none of these systems are useful for using manual Morse at practical speeds.
The original radio stations were primarily used for private point-to-point communication. The early 1920s saw the introduction of radio broadcasting, and by the end of 1922 there were over 500 broadcasting stations operating in the United States. Most of the first broadcasting stations received randomly assigned three-letter call signs.