| Code | Meaning / use |
|---|---|
| QRM | Interference from other stations or man-made sources. |
| QRN | Atmospheric or natural radio noise. |
| QRT | Stop transmitting or close down. |
| QRV | Ready to receive or operate. |
| QRX | Wait; I will call again. |
| QRZ | Who is calling me? |
| QSB | Signal strength is fading. |
| QSL | I acknowledge receipt; confirmation. |
| QSO | A radio contact or communication. |
| QSY | Change to another frequency. |
| QTH | Location of the station. |
| QTR | Correct time. |
Appendix B: Common Q codes
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