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In amateur radio, the Q-codes were originally used in Morse code transmissions to shorten lengthy phrases and were followed by a Morse code question mark ( ) if the phrase was a question. Q-codes are commonly used in voice communications as shorthand nouns, verbs, and adjectives making up phrases.
In Morse code, it is known as a "commat", consisting of the Morse code for the "A" and "C" which run together as one character: . The symbol was added in 2004 for use with email addresses, [55] the only official change to Morse code since World War I. In Nepali, the symbol is called "at the rate." Commonly, people will give their email ...
In military communications and amateur radio the terms "CW" and "Morse code" are often used interchangeably, despite the distinctions between the two. Aside from radio signals, Morse code may be sent using direct current in wires, sound, or light, for example. For radio signals, a carrier wave is keyed on and off to represent the dots and ...
When a telegraph message comes in it produces an audible "clicking" sound representing the short and long keypresses – "dots" and "dashes" – which are used to represent text characters in Morse code. A telegraph operator would translate the sounds into characters representing the telegraph message. Telegraph networks, used from the 1850s to ...
Cryptography was used extensively during World War II because of the importance of radio communication and the ease of radio interception.The nations involved fielded a plethora of code and cipher systems, many of the latter using rotor machines.
A code talker was a person employed by the military during wartime to use a little-known language as a means of secret communication.
American Morse Code — also known as Railroad Morse—is the latter-day name for the original version of the Morse Code developed in the mid-1840s, by Samuel Morse and Alfred Vail for their electric telegraph.
The first US ship to send a wireless distress call in 1905 simply sent HELP (in both International Morse and American Morse code). [ 3 ] : 218 On 7 December 1903, Ludwig Arnson was a wireless operator aboard the liner SS Kroonland when the ship lost a propeller off the Irish coast.