| QSO | A contact / conversation |
| QTH | Your location |
| QRT | Shutting down / leaving frequency |
| QSY | Change frequency |
| QRM | Man-made interference |
| QRN | Natural static / noise |
| QRZ? | "Who is calling me?" or "Who's there?" |
| QRX | "Stand by" / I'll call you back |
| 59 / 5-9 | Perfect readability and signal strength |
| 73 | Best regards (the classic ham farewell) |
| Over | Your transmission is done — expecting a reply |
| Out / Clear | Conversation is finished, closing the contact |
| Roger | Message received and understood |
| Break | Interrupting to add something urgent |