These codes were originally developed to shorten transmission times when using CW, but are frequently used in voice transmissions. (eg. I am going to go QRT, thanks for the QSO.) The QRA...QUZ code range includes phrases applicable to all services and is allocated to the International Telecommunications Union. NATO's ACP 131(E), COMMUNICATIONS INSTRUCTIONS - OPERATING SIGNALS, March 1997, chapter 2 contains a full list of 'Q' codes. Other 'Q' code ranges are allocated specifically to aviation or maritime services; many of those codes have fallen into disuse as voice displaces CW in commercial operation.
The Q-code was originally instituted at the Radiotelegraph Convention held in London, 1912 and was intended for marine radiotelegraph use. The codes were based on an earlier list published by the British postmaster general's office in 1908.[1] More information about the history and usage of Q-codes can be found here.
| Code | Meaning | Sample use |
|---|---|---|
| QRG | Exact frequency | HE TX ON QRG 14205 kHz |
| QRI | Tone (T in the RST code) | UR QRI IS 9 |
| QRK | Intelligibility (R in the RST code) | UR QRK IS 5 |
| QRL | This frequency is busy. | Used almost exclusively with morse code, usually as a question (QRL? - is this frequency busy?) before transmitting on a new frequency |
| QRM | Man-made interference | ANOTHER QSO UP 2 kHz CAUSING LOT OF QRM |
| QRN | Natural interference, e.g. static crashes | BAND NOISY TODAY LOT OF QRN |
| QRO | Increase power | NEED QRO WHEN PROP POOR |
| QRP | Decrease power | QRP TO 5 W (As a mode of operation, a QRP station is five watts or less, a QRPp station one watt or less) |
| QRQ | Send more quickly | TIME SHORT PSE QRQ |
| QRR | Temporarily unavailable/away, please wait | WILL BE QRR 30 MIN = THAT STN IS QRR NW |
| QRRR | Land distress | A non-standard call proposed by ARRL
for land-based or railroad emergency traffic in situations where
response from ships at sea (which listened for SOS) was neither needed nor desired.[2][3] Now deprecated.
|
| QRS | Send more slowly | PSE QRS NEW TO CW (QRS operation - a slower dot rate - is useful during weak-signal conditions; a QRSS mode uses an extremely low code rate on a channel less than 1Hz wide to allow reception under extreme QRP conditions) |
| QRT | Stop sending | ENJOYED TALKING 2 U = MUST QRT FER DINNER NW |
| QRU | Have you anything for me? | QRU? ABOUT TO QRT |
| QRV | I am ready | WL U BE QRV IN UPCOMING CONTEST? |
| QRX | Will call you again | QRX @ 1500H |
| QRZ | You are being called by ________. | QRZ? UR VY WEAK (Only someone who has previously called should reply) |
| QSA | Signal strength | UR QSA IS 5 |
| QSB | Fading of signal | THERE IS QSB ON UR SIG |
| QSD | Your keying is defective | QSD CK YR TX |
| QSK | Break-in | I CAN HR U DURING MY SIGS PSE QSK |
| QSL | I Acknowledge receipt | QSL UR LAST TX = PSE QSL VIA BURO (i.e. please send me a card confirming this contact). |
| QSM | Repeat last message | QRM DROWNED UR LAST MSG OUT = PSE QSM |
| QSN | I heard you | QSN YESTERDAY ON 7005 kHz |
| QSO | A conversation | TNX QSO 73 |
| QSP | Relay | PSE QSP THIS MSG TO MY FRIEND |
| QST | General call to all stations | QST: QRG ALLOCS HV CHGD |
| QSX | I am listening on ... frequency | QSX 14200 TO 14210 kHz |
| QSY | Shift to transmit on ... | LETS QSY UP 5 kHz |
| QTA | Disregard last message | QTA, DID NOT MEAN THAT |
| QTC | Traffic | STN WID EMRG QTC PSE GA |
| QTH | Location | QTH IS SOUTH PARK CO |
| QTR | Exact time | QTR IS 2000 Z |
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