Variations
An example RST report for a voice transmission is "59", usually pronounced "five nine" or "five by nine", a report that indicates a perfectly readable and very strong signal. Exceptionally strong signals are designated by the quantitative number of decibels, in excess of "S9", displayed on the receiver's S meter. Example: "Your signal is 30 dB over S9."
Suffixes were historically added to indicate other signal properties, and might be sent as "599K":
- X: stable frequency (crystal control)
- C: "chirp" (frequency shift when keying)
- K: key clicks
Because the N character in Morse code requires less time to send than the 9, during amateur radio contests where the competing amateur radio stations are all using Morse code, the nines in the RST are typically abbreviated to N to read 5NN.
Read more about this topic: RST Code
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