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The code is used to transmit standard messages, sometimes with customized text, very quickly by experienced ARRL National Traffic System (NTS) message traffic handlers. In use, ARRL Numbered Radiograms are messages encoded as one or two numbers. The numbers are always written down as words, and are always preceded by the procedure word "ARL".
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of Hartford, Connecticut .
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. [20]
Because the N character in Morse code requires less time to send than the 9, during amateur radio contests where the competing amateur radio stations are all using Morse code, the nines in the RST are typically abbreviated to N to read 5NN. [11] In general, this practice is referred to as abbreviated or "cut" numbers. [12] [13] [14]
The text of the daily W1AW code practice sessions is taken directly from the pages of recent issues of QST, the ARRL's monthly magazine. At the beginning of each practice session the QST year and month of publication as well as the page numbers are given followed by the article being transmitted at 5, 7-1/2, 10, 13 and 15 words per minute for ...
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Radio amateurs have been early in arranging relay leagues, as is reflected in the name of the organization of American Radio Relay League (ARRL). Radio amateur message relay operations were originally conducted in the first two decades of the 20th century using Morse code via spark-gap transmitters .
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