RST Signal Report Guide
Readability, strength, and tone reference for signal reports.
R — Readability (1–5)
| 1 | Unreadable |
| 3 | Readable with difficulty |
| 5 | Perfectly readable |
S — Strength (1–9)
| 1 | Faint |
| 5 | Good |
| 9 | Extremely strong |
T — Tone (1–9, CW only)
| 1 | Very rough note |
| 9 | Perfect tone |
Phone/SSB: RS only (e.g. 59). CW: RST (e.g. 579). Digital: often 599 or RS equivalent. Be honest — helps ops adjust power and antennas.