Signal Reporting Using The RST System
Signal Reporting Using The RST System

READABILITY
1
Unreadable
2
Barely readable; only occasional words distinguishable
3
Readable but with considerable difficulty
4
Readable with practically no difficulty
5
Perfectly readable
SIGNAL STRENGTH
1
Very faint signals
2
Very weak signals
3
Weak signals
4
Fair signals
5
Fairly good signals
6
Good signals
7
Moderately strong signals
8
Strong signals
9
Extremely strong signals
TONE
1
A sixty-cycle hum is present on the signal. Very rough and raw to listen to
2
Very rough, harsh and broad a.c. hum is present on the signal.
3
Rough a.c. tone, rectified but not filtered.
4
Rough note, some trace of filtering.
5
Filtered rectified a.c. but strongly ripple-modulated.
6
Filtered tone, definite trace of ripple modulation.
7
Near pure tone, trace of ripple modulation
8
Near perfect tone, slight trace of modulation.
9
Perfect note, no trace of ripple or modulation of any kind.
R = Readability
S = Signal Strength
T = Tone
Tone is used for CW, RTTY and other digital transmissions.