There are a lot of Q Codes that used by amateurs, but only a small percentage of them are used. The reason for this is that some of the are reference only for shipping, aircraft, police etc. These fall into the following patterns
QAA – QNZ – Aeronautical
QOA – QOZ – Maritime
QRA – QUZ – All Services
QZA – QZZ – Other
The Q Codes listed below form a question and answer format.
| Q Code | CW Meaning |
|---|---|
| QRA | What is your Callsign? |
| QRL | Is this Frequency Busy? |
| QRM | Signal Interference Man-made |
| QRN | Signal Interference Natural (Static / Atmospheric Noise) |
| QRO | Increase Transmitter Power |
| QRP | Decrease Transmitter Power |
| QRQ | Send Faster |
| QRS | Send Slower |
| QRT | Stop Transmitting |
| QRU | I have no more messages |
| QRV | Ready to Transmit |
| QRW | Shall I tell (Callsign) you're calling them? |
| QRX | Standby Please |
| QRZ | Who is calling me? Anyone can call |
| QSB | Signals are fading |
| QSK | Break in Operation |
| QSL | Can you acknowledge receipt? |
| QSM | Shall I Repeat my last Message? |
| QSO | Radio Contact Between Stations |
| QSP | Will you relay to ...? |
| QST | A General Call Preceding Messages to all Eadio Operators (info/news) |
| QSV | Call I send a Series of V's? |
| QSW | Will you Transmit On...? |
| QSX | Will you listen on ... (Freq) |
| QSY | Change Frequency |
| QTH | Station Location |
| QTR | What is your Correct Time? |
| QTX | Keep your Station Open Please |