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Morse initially had code points only for numerals. He planned that numbers sent over the telegraph would be used as an index to a dictionary with a limited set of words. Vail invented an extended code that included code points for all the letters so that any desired word could be sent. It was Vail's code that became American Morse.
Many models of communication include the idea that a sender encodes a message and uses a channel to transmit it to a receiver. Noise may distort the message along the way. The receiver then decodes the message and gives some form of feedback. [1] Models of communication are simplified representations of the process of communication.
The British Naval Cypher No. 5 is also known to have been broken by the B-Dienst, as were various low-grade British Naval and Air codes, including COFOX, MEDOX, FOXO, LOXO, SYKO, Air Force code and Aircraft Movement code. The US "Hagelin" M-209 field cipher machine and the French "Anglp" [clarification needed] code were also often read.
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-air communication. Since then ...
International Code of Signals for Visual, Sound, and Radio Communications, United States Edition, 1969 ... These code words are used only in national operations, ...
Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications.. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organizations such as firefighters, police forces, and transportation organizations also use the term.
A plain-language radio check is the means of requesting and giving a signal strength and readability report for radiotelephony (voice) communications, and is the direct equivalent to the QSA and QRK code used to give the same report in radiotelegraph communications. SINPEMFO code is the voice signal reporting format developed by the ITU in 1959 ...
The Hundred Code is a three-digit police code system. [3] This code is usually pronounced digit-by-digit, using a radio alphabet for any letters, as 505 "five zero five" or 207A "two zero seven Alpha".