RST Signal Reports

The RST code is used by amateur radio operators, shortwave listeners, and other radio hobbyists to grade the quality of a radio signal being received. The code is a three digit number, with one digit each for the signal's READABILITY, STRENGTH and TONE.

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R-S-T
Characteristics

Readability
R

Strength
S

Tone (CW only)
T

1

Unreadable

Faint signals, barely perceptible

Sixty cycle a.c or less, very rough and broad

2

Barely readable, occasional words distinguishable

Very weak signals

Very rough a.c., very harsh and broad

3

Readable with considerable difficulty

Weak signals

Rough a.c. tone, rectified but not filtered

4

Readable with practically no difficulty

Fair signals

Rough note, some trace of filtering

5

Perfectly readable

Fairly good signals

Filtered rectified a.c. but strongly ripple-modulated

6

N/A

Good signals

Filtered tone, definite trace of ripple modulation

7

N/A

Moderately strong signals

Near pure tone, trace of ripple modulation

8

N/A

Strong signals

Near perfect tone, slight trace of modulation

9

N/A

Extremely strong signals

Perfect tone, no trace of ripple or modulation of any kind

 

 

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