QSK operation (full break-in)
Morse code operating mode / From Wikipedia, the free encyclopedia
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In CW Morse code operations, QSK or full break-in operation describes an operating mode in which the transmitting station can detect signals from other stations between the elements (dots and dashes) or letters of the Morse transmission. This allows other stations to interrupt the transmitting station between individual coding elements, and such allows for a conversational style of communication.
"QSK" is one of the Q-code signals established for radiotelegraph operators in the first decade of the 1900s. The three letter code "QSK" literally means "I can hear you between my signals; you may break in on my transmission." Although Morse code is no longer used for commercial or professional purposes, it continues to be used in amateur radio.
In QSK or full break-in operation the silent periods between the Morse code dits and dahs enable operators to listen between their transmitted signals for the signals of the counterpart, thus enabling a conversational style of communication. This is especially useful in high-speed telegraphy.