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R	Readability	S	Signal Strength	T	CW Tone Quality
1	Unreadable	1	Faint signals Barely perceptible	1	Sixty cycle A.C. or less Very rough and broad
2	Barely readable Occasional words distinguishable	2	Very weak signals	2	Very rough A.C. Very harsh and broad
3	Readable Considerable difficulty	3	Weak signals	3	Rough A.C. tone Rectified but not filtered
4	Readable Practically no difficulty	4	Fair signals	4	Rough note, some trace of filtering
5	Perfectly readable	5	Fairly good signals	5	Filtered rectified A.C. But strongly ripple-modulated
		6	Good signals	6	Filtered tone Definite trace of ripple modulation
		7	Moderately strong signals	7	Near pure tone Trace of ripple modulation
		8	Strong signals	8	Near perfect tone Slight trace of modulation
		9	Extremely strong signals	9	Perfect tone, no trace of ripple or modulation of any kind

S	Signal Strength	I	Interference	N	Noise	P	Propagation	O	Overall Quality
1	Barely Audible	1	Extreme	1	Extreme	1	Extreme	1	Unusable
2	Poor	2	Severe	2	Severe	2	Severe	2	Poor
3	Fair	3	Moderate	3	Moderate	3	Moderate	3	Fair
4	Good	4	Slight	4	Slight	4	Slight	4	Good
5	Excellent	5	Nil	5	Nil	5	Nil	5	Excellent

F	Fading Frequency	E	Modulation Excellence	M	Modulation Magnitude
1	Very fast	1	Very poor	1	Continuously Overdriven
2	Fast	2	Poor	2	Poor
3	Moderate	3	Fair	3	Fair
4	Slow	4	Good	4	Good
5	Nil	5	Excellent	5	Maximum