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This code, was developped in 1912 to facilitate Morse communication between radio operators using different languages.
It presented several advantages: language independence, increased transmission speed and improved security.
Q Code abbreviations, composed of three letters of which the first is always Q, are questions or answers depending on the context.
| QRG | Exact frequency |
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| QRI | Tone (T in the RST code) |
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| QRK | Intelligibility (R in the RST code) |
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| QRL | This frequency is busy. |
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| QRM | Man-made interference |
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| QRN | Natural interference, e.g. static crashes |
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| QRO | Increase power |
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| QRP | Decrease power |
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| QRQ | Send faster |
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| QRR | Temporarily unavailable/away, please wait |
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| QRRR | Distress |
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| QRS | Send slower |
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| QRT | Stop sending |
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| QRU | Have you anything for me? |
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| QRV | I am ready |
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| QRX | Will call you again |
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| QRZ | You are being called by… |
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| QSA | Signal strength |
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| QSB | Fading of signal |
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| QSD | Your keying is defective |
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| QSK | Break-in |
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| QSL | I Acknowledge receipt |
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| QSM | Repeat last message |
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| QSN | I heard you |
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| QSO | A conversation |
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| QSP | Relay |
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| QST | General call to all stations |
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| QSX | I am listening on … frequency |
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| QSY | Shift to transmit on … |
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| QTA | Disregard last message |
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| QTC | Traffic |
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| QTH | Location |
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| QTR | Exact time |
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