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The Q code is a standardized collection of three-letter message encodings, also known as a brevity code, all of which start with the letter "Q", initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio. [1]

40 relations: ACP-131, Air traffic control, Amateur radio, Amateur radio operator, American Radio Relay League, Atmospheric pressure, Aviation, Bletchley Park, Brevity code, Call sign, Contact (amateur radio), Government, International Civil Aviation Organization, International Code of Signals, International maritime signal flags, International Radiotelegraph Convention (1912), International Telecommunication Union, ITU prefix, ITU-R, Language, Lorenz cipher, Maritime Mobile Service Q Codes, Miami-Dade County, Florida, Morse code, NATO, Postmaster General of the United Kingdom, Prosigns for Morse code, QN Signals, QNH, QRP operation, QSL card, QST, Radio atmospheric, Radioteletype, Spark-gap transmitter, Ten-code, Transceiver, United Kingdom, Wireless telegraphy, Z code.


ACP-131 is the controlling publication for the listing of Q codes and Z codes.

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Air traffic control

Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and through controlled airspace, and can provide advisory services to aircraft in non-controlled airspace.

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Amateur radio

Amateur radio (also called "ham" radio) describes the use of radio frequency spectra for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation and emergency communication.

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Amateur radio operator

An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service.

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American Radio Relay League

The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the USA.

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Atmospheric pressure

Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere of Earth (or that of another planet).

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Aviation is the practical aspect or art of aeronautics, being the design, development, production, operation and use of aircraft, especially heavier-than-air aircraft.

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Bletchley Park

Bletchley Park, in Milton Keynes, Buckinghamshire, England, was the central site of the United Kingdom's Government Code and Cypher School (GC&CS), which during the Second World War regularly penetrated the secret communications of the Axis Powersmost importantly the German Enigma and Lorenz ciphers.

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Brevity code

Brevity codes are used in amateur radio, maritime, aviation and military communications.

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Call sign

In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique designation for a transmitting station.

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Contact (amateur radio)

An amateur radio contact, more commonly referred to as simply a "contact", is an exchange of information between two amateur radio stations.

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A government is the system by which a state or community is controlled.

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International Civil Aviation Organization

The International Civil Aviation Organization (ICAO, pronounced; Organisation de l'aviation civile internationale, OACI), is a specialized agency of the United Nations.

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International Code of Signals

The International Code of Signals (ICS) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters.

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International maritime signal flags

The system of international maritime signal flags is one system of flag signals representing individual letters of the alphabet in signals to or from ships.

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International Radiotelegraph Convention (1912)

The International Radiotelegraph Convention (1912) established international callsigns, replacing the three letter callsigns prevalent then.

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International Telecommunication Union

The International Telecommunication Union (ITU; Union Internationale des Télécommunications), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.

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ITU prefix

The International Telecommunication Union (ITU) allocates call sign prefixes for radio and television stations of all types.

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The ITU Radiocommunication Sector (ITU-R) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU) and is responsible for radio communication.

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Language is the ability to acquire and use complex systems of communication, particularly the human ability to do so, and a language is any specific example of such a system.

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Lorenz cipher

The Lorenz SZ40, SZ42A and SZ42B were German rotor stream cipher machines used by the German Army during World War II.

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Maritime Mobile Service Q Codes

Part of a larger set of Q Codes designated by the ITU-R, the QOA–QQZ code range is reserved for the Maritime Mobile Service.

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Miami-Dade County, Florida

Miami-Dade County (commonly called Dade County, Dade, Metro-Dade or Greater Miami) is a county located in the southeastern part of the State of Florida and is the southeasternmost county on the U.S. mainland.

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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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The North Atlantic Treaty Organization (NATO; Organisation du traité de l'Atlantique Nord; OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949.

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Postmaster General of the United Kingdom

The Postmaster General of the United Kingdom was a Cabinet-level ministerial position in HM Government.

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Prosigns for Morse code

In Morse code, prosigns or procedural signals are dot/dash sequences that do not represent text per se, but have a special meaning in a transmission: they are generally not copied down; they are a telegraphic form of control character.

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QN Signals

The QN Signals are Morse code operating signals that were introduced for Amateur radio net operation in 1939 on the Michigan QMN Net to lighten the burdens of net control operators.

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QNH is one of the many Q codes.

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QRP operation

In amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range.

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QSL card

A QSL card is a written confirmation of either a two-way radiocommunication between two amateur radio stations or a one-way reception of a signal from an AM radio, FM radio, television or shortwave broadcasting station.

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QST is a magazine for amateur radio enthusiasts, published by the American Radio Relay League (ARRL).

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Radio atmospheric

A radio atmospheric signal or sferic (sometimes also spelled "spheric") is a broadband electromagnetic impulse that occurs as a result of natural atmospheric lightning discharges.

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Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link.

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Spark-gap transmitter

A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.

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Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement and in Citizens Band (CB) radio transmissions.

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A transceiver is a device comprising both a transmitter and a receiver which are combined and share common circuitry or a single housing.

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United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign state in Europe.

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Wireless telegraphy

Wireless telegraphy is the transmission of electric telegraphy signals without wires (wirelessly).

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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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Redirects here:

Q Code, Q Codes, Q codes, Q signal, Q signals, Q-code, Q-codes, Q-signal, QNB (amateur radio), QNB:Amateur Radio, QRN, QRO, QRZ, Qra, Qro.


[1] https://en.wikipedia.org/wiki/Q_code

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