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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. Although Q codes were created when radio used Morse code exclusively, they continued to be employed after the introduction of voice transmissions. To avoid confusion, transmitter call signs are restricted; while an embedded three-letter Q sequence may occur (for instance when requested by an amateur radio station dedicated to low-power operation), no country is ever issued an ITU prefix starting with "Q". The codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services.

Amateur radioEdit

Selected Q codes were soon adopted by amateur radio operators. 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 (··--··) if the phrase was a question.

Q codes are commonly used in voice communications as shorthand nouns, verbs, and adjectives making up phrases. For example, an amateur radio operator will complain about QRM (man-made interference), or tell another operator that there is "QSB on the signal"; "to QSY" is to change your operating frequency.

Q codes applicable for use in amateur radioEdit

Code Question Answer or Statement
QRA What is the name (or call sign) of your station? The name (or call sign) of my station is ...
QRG Will you tell me my exact frequency (or that of ...)? Your exact frequency (or that of ... ) is ... kHz (or MHz).
QRH Does my frequency vary? Your frequency varies.
QRI How is the tone of my transmission? The tone of your transmission is (1. Good; 2. Variable; 3. Bad)
QRJ How many voice contacts do you want to make? I want to make ... voice contacts.
QRK What is the readability of my signals (or those of ...)? The readability of your signals (or those of ...) is ... (1 to 5).
QRL Are you busy? I am busy. (or I am busy with ... ) Please do not interfere.
QRM Do you have interference? I have interference.
QRN Are you troubled by static? I am troubled by static.
QRO Shall I increase power? Increase power.
QRP Shall I decrease power? Decrease power.
QRQ Shall I send faster? Send faster (... wpm)
QRS Shall I send more slowly? Send more slowly (... wpm)
QRT Shall I cease or suspend operation?/ shutoff the radio I am suspending operation. /shutting off the radio
QRU Have you anything for me? I have nothing for you.
QRV Are you ready? I am ready.
QRW Shall I inform ... that you are calling him on ... kHz (or MHz)? Please inform ... that I am calling him on ... kHz (or MHz).
QRX When will you call me again? I will call you again at ... (hours) on ... kHz (or MHz)
QRZ Who is calling me? You are being called by ... on ... kHz (or MHz)
QSA What is the strength of my signals (or those of ... )? The strength of your signals (or those of ...) is ... (1 to 5).
QSB Are my signals fading? Your signals are fading.
QSD Is my keying defective? Your keying is defective.
QSG Shall I send ... telegrams (messages) at a time? Send ... telegrams (messages) at a time.
QSK Can you hear me between your signals? I can hear you between my signals.
QSL Can you acknowledge receipt? I am acknowledging receipt.
QSM Shall I repeat the last telegram (message) which I sent you, or some previous telegram (message)? Repeat the last telegram (message) which you sent me (or telegram(s) (message(s)) numbers(s) ...).
QSN Did you hear me (or ... (call sign)) on .. kHz (or MHz)? I did hear you (or ... (call sign)) on ... kHz (or MHz).
QSO Can you communicate with ... direct or by relay? I can communicate with ... direct (or by relay through ...).
QSP Will you relay a message to ...? I will relay a message to ... .
QSR Do you want me to repeat my call? Please repeat your call; I did not hear you.
QSS What working frequency will you use? I will use the working frequency ... kHz (or MHz).
QST - Here is a broadcast message to all amateurs.
QSU Shall I send or reply on this frequency (or on ... kHz (or MHz))? Send or reply on this frequency (or on ... kHz (or MHz)).
QSW Will you send on this frequency (or on ... kHz (or MHz))? I am going to send on this frequency (or on ... kHz (or MHz)).
QSX Will you listen to ... (call sign(s) on ... kHz (or MHz))? I am listening to ... (call sign(s) on ... kHz (or MHz))
QSY Shall I change to transmission on another frequency? Change to transmission on another frequency (or on ... kHz (or MHz)).
QSZ Shall I send each word or group more than once? Send each word or group twice (or ... times).
QTA Shall I cancel telegram (message) No. ... as if it had not been sent? Cancel telegram (message) No. ... as if it had not been sent.
QTC How many telegrams (messages) have you to send? I have ... telegrams (messages) for you (or for ...).
QTH What is your position in latitude and longitude (or according to any other indication)? My position is ... latitude...longitude
QTR What is the correct time? The correct time is ... hours
QTU At what times are you operating? I am operating from ... to ... hours.
QTX Will you keep your station open for further communication with me until further notice (or until ... hours)? I will keep my station open for further communication with you until further notice (or until ... hours).
QUA Have you news of ... (call sign)? Here is news of ... (call sign).
QUC What is the number (or other indication) of the last message you received from me (or from ... (call sign))? The number (or other indication) of the last message I received from you (or from ... (call sign)) is ...
QUD Have you received the urgency signal sent by ... (call sign of mobile station)? I have received the urgency signal sent by ... (call sign of mobile station) at ... hours.
QUE Can you speak in ... (language), - with interpreter if necessary; if so, on what frequencies? I can speak in ... (language) on ... kHz (or MHz).
QUF Have you received the distress signal sent by ... (call sign of mobile station)? I have received the distress signal sent by ... (call sign of mobile station) at ... hours.
International Morse Code

Chart of the Morse code letters and numerals.

Some of the common usages vary somewhat from their formal, official sense. QRL? is the accepted form of the question, "Is this frequency in use (or busy)?", the reply to which is typically the letters "C" (dah di dah dit), "R" (di dah dit) or "Y" (dah di dah dah) which, in the Amateur radio tradition, are the Morse code shorthand for "Confirm", "Roger" or "Yes." There are also a few unofficial and humorous codes in use, such as QLF ("try sending with your LEFT foot") and QSC ("send cigarettes", not the official meaning of "this is a cargo vessel"). In the question form, QNB?, is supposed to mean "How many buttons does your radio have?" A reply of the form QNB 45/15 means "45, and I know what 15 of them do." QSJ is sometimes used to refer to the cost of something - "I would like an FT9000 but it is too much QSJ". (QSJ actually means "What is the charge to be collected to ... including your internal charge?").

QSK - "I can hear you during my transmission" - refers to a particular mode of Morse code operating in which the receiver is quickly enabled during the spaces between the dits and dahs, which allows another operator to interrupt transmissions. Many modern transceivers incorporate this function, sometimes referred to as full break-in as against semi-break-in in which there is a short delay before the transceiver goes to receive.

A conversation or contact via amateur radio is often referred to as a QSO, while QSL cards are collected by both radioamateurs and shortwave listeners as confirmation of having received the signal of a particular station.

Regarding the speed of the Morse code being sent, if the speed is too fast and the receiving operator cannot copy the code at said speed, that operator may send "QRS", the request to "please slow down." A courteous sender will slow down to match the speed of the slower operator.

QTHR - "at the registered address for my callsign", this is used mainly in the United Kingdom and former colonies. Since business may not be discussed on amateur radio, a ham who has personal equipment to sell might say something like "I have a spare Morse key old chap, please contact me QTHR".

Note: The ARRL codes QNA-QNZ overlap with International Civil Aviation Organization (ICAO) codes but have different meanings.

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