, or

For amateur cw operation, this code, devised originally by W2BSR, is now universally adopted.
R denotes readability, S indicates signal strength, and T the tone report.
On telephony a similar code is used, but the Tone report is omitted.

'R' Code	Meaning
R1	Unreadable
R2	Barely readable, occasional words distinguishable
R3	Readable with considerable difficulty
R4	Readable with practically no difficulty
R5	Perfectly readable
'S' Code	Meaning
S1	Faint, signals barely perceptible
S2	Very weak signal
S3	Weak signal
S4	Fair signal
S5	Fairly good signal
S6	Good signal
S7	Moderately strong signal
S8	Strong signal
S9	Extremely strong signal
'T' Code	Meaning
T1	Extremely rough hissing note
T2	Very rough ac note, no trace of musicality
T3	Rough, low-pitched ac note, slightly musical
T4	Musically modulated note
T5	Near dc note, smooth ripple
T6	Modulated note, slight trace of whistle
T7	Near dc note, smoorth ripple
T8	Good dc note, just a trace of ripple
T9	Purest dc note

If the Note appears to be crystal controlled, add 'X' after the appropriate number.

Where there is Chirp - add C,      Drift - add D,      Clicks - add 'K'