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Amateur Radio
RST Code
RST Code
Amateur Radio Books
Ham Radio
RST Code
The RS Code is used to send signal reports during
Telephony
(AM, FM, or SSB) contacts.
The RST Code is used to send signal reports during
Telegraphy
(CW - Morse Code) contacts.
- R - stands for Readability.
- S - stands for Signal Strength.
- T - stands for Tone.
International
RST CODE
Readability
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R1
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Unreadable.
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R2
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Barely readable - occasional words distinguishable.
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R3
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Readable with considerable difficulty.
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R4
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Readable with practically no difficulty.
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R5
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Perfectly readable.
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Signal Strength
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S1
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Faint signal - barely perceptible.
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S2
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Very weak signal.
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S3
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Weak signal.
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S4
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Fair signal.
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S5
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Fairly good signal.
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S6
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Good signal.
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S7
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Moderately strong signal.
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S8
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Strong signal.
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S9
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Extremely strong signal.
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Tone
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T1
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Extremely rough hissing note.
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T2
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Very rough AC note - no trace of musicality.
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T3
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Rough, low-pitched AC note - slightly musical.
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T4
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Rather rough AC note - moderately musical.
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T5
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Musically modulated note.
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T6
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Modulated note - slight trace of whistle.
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T7
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Near DC note - smooth ripple.
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T8
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Good DC note - just a trace of ripple.
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T9
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Purest DC note.
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Paul Corrigan G4JNN
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