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Signal Reports (RST)
4 entriesThe RST system — Readability (1–5), Strength (1–9), Tone (1–9, CW only). '59' spoken on SSB, '599' sent on CW.
| Name / Channel | Details |
|---|---|
| R1–R5 Readability | 1 Unreadable · 2 Barely readable · 3 Readable with difficulty · 4 Readable with little difficulty · 5 Perfectly readable. |
| S1–S9 Strength | 1 Faint · 3 Weak · 5 Fairly good · 7 Moderately strong · 9 Extremely strong. S-meter '+20 dB' = 20 dB over S9. |
| T1–T9 Tone (CW) | 1 Very rough AC hum … 7 Near-pure with ripple · 9 Perfect tone. Almost everything modern is a 9. |
| '59' / '599' | 'You're five-nine' = perfectly readable, extremely strong. The default (often reflexive) contest exchange — sent '5NN' in CW shorthand. |