Highfields Amateur Radio Club
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RST Codes.
Contributed by a club member.

Readability
Code.
Meaning.
1Unreadable.
2Barely readable.
3Readable with difficulty.
4Readable with little difficulty.
5Perfectly readable.
Signal
Strength
Code.
Meaning.
1Barely detectable.
2Very weak signals.
3Weak signals.
4Fair signals.
5Fairly good signals.
6Good signals.
7Moderately strong signals.
8Strong signals.
9Very strong signals.
Tone
Code.
Meaning.
1Extremely rough note.
2Very rough note.
3Rough note.
4Fairly rough note.
5Note modulated
with strong ripple.
6Modulated note.
7Near DC note
but with smooth ripple.
8Near DC note
but with trace of ripple.
9Pure DC note.


The system known as RST reporting is normally used to give and receive useful and consistent signal reports between contacts.

As the name indicates, the RST reporting system is based around three numbers:

        Readability

        Signal strength

        Tone (This being the 'note' of the Morse code transmission).

The meanings for the different numbers are given in the table on the right of the page.





NOTES:

A voice or telephony signal may be given a report of 5 and 7 if the signal is perfectly readable and is moderately strong.

A Morse signal that is totally readable, moderately strong, and has a pure dc note would be given a report 579.

Many receivers incorporate strength or "S" meters and these can be very helpful when trying to judge the strength of a station. The meters are calibrated in "S" units up to S9 and then beyond that they are sometimes calibrated in decibels over S9.

However one thing that you should remember is that Signal Meters fitted to radios are not always accurately calibrated and should only be used as a rough giide.



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