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System of
an estimation of an accepted signal
RST
- RS
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The necessary minimum of information interchange at
a radio communication is signal the correspondent
and an estimation of audibility of your signal,
transferred by him for you.
To estimate signals of the correspondent, operators
apply so-called system " RST " consisting
of three (to telegraph CW) or two (for telephony
SSB) figures.
The first - "R" estimate legibility of a
signal on a five-point scale,
the second - "S" - force of a signal on a
nine-mark scale,
the third - "T" - (tone) quality of tone
of a cable signal on a nine-mark scale.
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R
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Readability, QRK |
% |
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1 |
It is completely not legible
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<20
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2 |
Badly readable signal, separate words understand |
<40
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3 |
Satisfactory; the information is perceived with
difficulties
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60
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4 |
Good; all is perceived practically without difficulties
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>80
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5 |
The excellent legibility, is not present any difficulties
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>95
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S
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Signal strength |
QSA |
дБм |
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1 |
Hardly appreciable, extremely weak signals
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1 |
-121 |
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2 |
Very weak signals
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2 |
-115 |
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3 |
Weak signals
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2 |
-109 |
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4 |
Signals of a moderate level
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3 |
-103 |
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5 |
Signals at rather good level
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3 |
-97 |
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6 |
Signals with quite good level
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4 |
-91 |
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7 |
Signals of an average level
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4 |
-85 |
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8 |
Strong signals
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5 |
-79 |
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9 |
Very strong signals (on CW it is possible to transfer as
"N")
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5 |
-73
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T
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Tone (CW и RTTY),
QRI |
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1 |
Very rough, sibiliant signal, tone to
name difficultly
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2 |
Very hoarse background of an alternating current without traces
of musicality
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3 |
Hoarse background of an alternating current with attributes
of musical tone
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4 |
Tone
median musicalities modulation
rather hoarse background
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5 |
Tone is rather musical, but is
significant little modulation
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6 |
Musical tone appreciablly
little modulation
a
background of an alternating current
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7 |
Pulsations of an alternating current are smoothed, but not completely
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8 |
Clean
tone with insignificant traces
of pulsations
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9 |
The cleanest, ideal tone (it
is possible to transfer on CW as "N")
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Defective keying, QSD, QCM
(irrespective of cleanliness of the tone)
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C |
Chirp (chirpy, cheerpy) |
Chirping, gurgling manipulation
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D |
Drift (drifting, unstable) |
Drifting, not stable tone (QRH) |
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K |
Clicks (klicks, klix) |
Clicks at manipulation
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In practice QSO can
differ from the described circuit a little. Some operators,
for example, after a greeting at
once are represented the interlocutor, naming the
name.
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Home 
System RST
