| Q-Signal | Explanation |
| QRA | Name of station |
| QRB | Approximate distance from your station to mine |
| QRC | Accounts for charges to station liquidated by xxx private company |
| QRD | Where are you going; I am going to xxx |
| QRE | Nationality of station |
| QRF | Where do you come from; I come from xxx |
| QRG | Your exact wavelength in meters or frequency in kilocycles |
| QRH | My exact wavelength of frequency |
| QRI | Is my tone bad; my tone is bad |
| QRJ | Cannot receive you, signals too weak |
| QRK | Receive you well, signals good |
| QRL | Are you busy; I am busy |
| QRM | Being interfered with |
| QRN | Troubled by atmospherics |
| QRO | Increase power |
| QRP | Decrease power |
| QRQ | Send faster |
| QRS | Send more slowly |
| QRT | Stop sending |
| QRU | Have you anything for me; I have nothing for you |
| QRV | Send series of Vs |
| QRW | Advise xxx that I am calling him |
| QRX | Must I wait; wait! |
| QRY | Which is my turn; your turn is xxx |
| QRZ | Who is calling me; you a being called by xxx |
| QSA | Strength of signal (1-5) |
| QSB | Strength of signal varies |
| QSC | Signal disappears entirely at intervals |
| QSD | Is my keying bad; keying is bad |
| QSE | Signals distinct? Signals run together |
| QSF | Automatic transmission good? Automatic transmission fades out |
| QSG | Transmit telegrams by series of 5, 10, or xx |
| QSH | Send telegram one at a time |
| QSI | Send telegrams in alternate order without repetitions |
| QSJ | Charge to be collected per word |
| QSK | Suspend traffic and call again at (time) |
| QSL | Acknowledgement of receipt |
| QSM | Received acknowledgement of receipt |
| QSN | Can you receive me now; cannot receive you now |
| QSO | Can you/I can communicate with xxx |
| QSP | Relay free of charge |
| QSQ | Send each word or group once |
| QSR | Distress call from xxx has been attended to by yyy |
| QSU | Send on xxx meters (kilocycles) waves of Type A1, A2, A3, or B |
| QSV | Shift to wave of xxx meters (kilocycles) for rest of communications |
| QSW | I will send on xxx meters (kilocycles) waves of Type A1, A2, A3, or B |
| QSX | Wavelength (frequency) varies |
| QSY | Send on xxx meters (kilocycles) without changing type of wave |
| QSZ | Send each word or group twice |
| QTA | Cancel telegram # xxx if not yet sent |
| QTB | Agree with word count? I do not agree with word count |
| QTC | Number of telegrams sent |
| QTD | Word count that you are confirming is accepted |
| QTE | True bearing is xxx degrees |
| QTF | Position of your station based on bearings is xxx |
| QTG | 1 minute call signal for radio compass bearings |
| QTH | Position in latitude/longitude (or any other indication) |
| QTI | True course |
| QTJ | Speed in knots |
| QTK | True bearing relative to me is xxx degrees |
| QTL | Sending signals to permit bearing with respect to the radio beacon |
| QTM | Sending radio and submarine sound signals to permit bearing and distance |
| QTN | Cannot take bearing of your station |
| QTP | Going to enter dock or port |
| QTR | Exact time |
| QTS | True bearing of my station relative to you |
| QTU | Station open from xxx to yyy (times) |
