Q codes are standardized three-letter message encodings used for radiotelegraph communication. They are also known as brevity codes. The codes in the range QAA–QNZ are reserved for aeronautical use, QOA–QQZ for maritime use, and QRA–QUZ for all services. Below is a list of codes commonly used by ham radio operators.
| 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/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 - bad; 2 - poor; 3 - fair; 4 - good; 5 - excellent). |
| 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 | Should I increase power? | Increase power. |
| QRP | Should I decrease power? | Decrease power. |
| QRQ | Should I send faster? | Send faster (___ wpm). |
| QRS | Should I send more slowly? | Send more slowly (___ wpm). |
| QRT | Should I stop sending? | Stop sending. |
| QRU | Do you have anything for me? | I have nothing for you. |
| QRV | Are you ready? | I am ready. |
| QRW | Should I inform ___ that you are calling him on ___ kHz/MHz? | Please inform ___ that I am calling him on ___ kHz/MHz. |
| QRX | When will you call me again? | I will call you again at ___ (hours) on ___ kHz/MHz. |
| QRZ | Who is calling me? | You are being called by ___ on ___ kHz/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 | Should 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 | Should I repeat the last telegram (message) which I sent you, or some previous telegram (message)? | Repeat the last telegram (message) which you sent me. |
| QSN | Did you hear me (or ___ (call sign)) on ___ kHz/MHz? | I did hear you (or ___ (call sign)) on ___ kHz/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/MHz. |
| QST | -- | Here is a broadcast message to all amateurs. |
| QSU | Should I send or reply on this frequency (or on ___ kHz/MHz)? | Send or reply on this frequency (or on ___ kHz/MHz). |
| QSW | Will you send on this frequency (or on ___ kHz/MHz)? | I am going to send on this frequency (or on ___ kHz/MHz). |
| QSX | Will you listen to ___ (call sign(s) on ___ kHz/MHz)? | I am listening to ___ (call sign(s) on ___ kHz/MHz) |
| QSY | Should I change to transmission on another frequency? | Change to transmission on another frequency (or on ___ kHz/MHz). |
| QSZ | Should I send each word or group more than once? | Send each word or group twice (or ___ times). |
| QTA | Should I cancel telegram (message) number ___ as if it had not been sent? | Cancel telegram (message) number ___ as if it had not been sent. |
| QTC | How many telegrams (messages) do you have to send? | I have ___ telegrams (messages) for you (or for ___). |
| QTH | What is your position in latitude and longitude? | 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 | Do you have 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/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. |