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Amateur radio has adapted two different sets of Q-codes for use in amateur communications. The first set comes from the ITU civil series QRA through QUZ. Most of the meanings are identical to the ITU definitions, however, they must be looked at in the context of amateur communications. For example, QSJ? asks what the charges are for sending the telegraph. Since by regulation amateur communications are without charge, this Q-code couldn't make sense.
The second set is the set of [[QN Signals]], used only in ARRL [[National Traffic System|NTS]] nets. These operating signals generally have no equivalent in the ACP 131 publication or ITU publications, and are specifically defined only for use in ARRL NTS nets. They are not used in casual amateur radio communications.<ref>{{cite web |title=Operating Signals |date=12 December 2014 |publisher=[[American Radio Relay League|ARRL]] [[National Traffic System]] (NTS) |url=https://wb8ylo.wordpress.com/2014/12/11/operating-signals/ |access-date=30 March 2015 |url-status=dead |archive-date=2 April 2015 |archive-url=https://web.archive.org/web/20150402182452/https://wb8ylo.wordpress.com/2014/12/11/operating-signals/ }}</ref><ref>{{cite web |title=FSD-218 – Field Service Form: Instructions for NTS radiogram messages |url=http://www.arrl.org/files/file/Public%2520Service/fsd218.pdf}}</ref>
Selected Q-codes were soon adopted by [[amateur radio operator]]s. In December 1915, the [[American Radio Relay League]] began publication of a magazine titled ''[[QST]]'', named after the Q-code for "General call to all stations". 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 ({{morse|dot|dot|dash|dash|dot|dot}}) if the phrase was a question.
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