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The RST / Radio Reports

A "Rig Check" is the common slang term given to someone requesting a on-air check for both their signal strength and the clarity of the audio.

Readability

R1 Unreadable
R2 Barely readable, occasional words distinguishable
R3 Readable with considerable difficulty
R4 Readable with practically no difficulty
R5 Perfectly readable

Signal Strength

S1 Faint, signals barely perceptible
S2 Very week signals
S3 Week signals
S4 Fair signal
S5 Fairly good signals
S6 Good signals
S7 Moderately strong signal
S8 Strong signals
S9 Extremely strong signals

Tone

T1 Extremely rough hissing note
T2 Very rough ac note, no trace of musicality
T3 Rough, low-pitched ac note, slightly musical
T4 Rather rough ac note, moderately musical
T5 Musically modulated note
T6 Modulated noise, slight trace of whistle
T7 Near dc note, smooth ripple
T8 Good dc note, just a trace of ripple
T9 Purest dc note