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READABILTY
1 -- Unreadable
2 -- Barely readable, occasional words distinguishable
3 -- Readable with considerable difficulty
4 -- Readable with practically no difficulty
5 -- Perfectly readable
SIGNAL STRENGTH
1 -- Faint signals, barely perceptible
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 -- Sixty cycle a.c. or less, very rough
and broad
2 -- Very rough a.c. , very harsh and broad
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 tone, no trace of ripple or modulation of any
kind
Infrequently used is the addition of a letter
to the end of the 3 numbers.
These are: X = the signal is rock steady like a crystal controlled
signal;
C = the signal is chirpy as the frequency varies slightly
with keying;
and K = the signal has key clicks.
X is from the early days of radio when such steady
signals were rare.
Today most all signals could be given an X but
it is hardly ever used. It is helpful to report a chirpy or
clicky signal by using the C or K, e.g. 579C or 579K.
Learn the Morse code or improve
your speed.
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