RST Codes
Quick Answer
Learn RST codes used by amateur radio operators to report readability, signal strength, and tone.
- Topic: Radio Communication
- Best use: fast reference, learning, and clear communication.
- Updated: 2025-08-11
RST reports tell another operator how readable, strong, and clean their signal is. Voice contacts usually use RS; CW contacts use RST.
Example Reports
A 59 voice report means perfectly readable and strong. A 599 CW report adds a clear tone report.
RST Signal Reports
| Element | Scale | Meaning |
|---|---|---|
| Readability | 1-5 | How easily the signal can be understood. |
| Signal Strength | 1-9 | How strong the signal is at the receiver. |
| Tone | 1-9 | CW tone quality; omitted for voice reports. |
| 599 | Best CW report | Perfect readability, strong signal, clear tone. |
| 59 | Best voice report | Perfect readability and strong signal. |