3 relations: Morse code, Q code, Z code.
Morse code
Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.
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Q code
The Q code is a standardized collection of three-letter codes all of which start with the letter "Q".
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Z code
Z Code (like Q Code and X Code) is a set of operating signals used in CW, TTY and RTTY radio communication.
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