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The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's readability, strength, and tone. [1] [2] The code was developed in 1934 ...
See media help. The International Radiotelephony Spelling Alphabet or simply Radiotelephony Spelling Alphabet, commonly known as the NATO phonetic alphabet, is the most widely used set of clear-code words for communicating the letters of the Roman alphabet. Technically a radiotelephonic spelling alphabet, it goes by various names, including ...
The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially amateur radio. To distinguish the use of a Q-code transmitted as a question from the same Q-code ...
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]
Map showing the numeral codes for amateur radio call signs in the United States. The region in which the operator was licensed determines the numeral. United States amateur radio call signs consist of one or two letters, followed by a single digit, and closing with one to three more letters. [21]
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
Phonemic orthography: an orthography that represents the sounds of a particular language in such a way that one symbol corresponds to each speech sound and vice versa Spelling alphabet a.k.a. radio alphabet: a set of code words for the names of the letters of an alphabet, used in noisy conditions such as radio communication; each word typically ...
An amateur operator's call sign is composed of a prefix, a separating numeral and a suffix. The prefix can be composed of letters or numbers, the separating numeral is between 0 and 9, and a suffix is from one to four characters, usually letters. [ 5] Examples of call signs and their constituent parts are as follows: