Technical Information

Operating Codes:
The R-S-T code & the Phonetic Alphabet

Page Index

[ Readability, Strength, Tone (R-S-T) ] [ Phonetic Alphabet ]

[ TOP ]

The R-S-T System

Source: ARRL FSD-220 (1/04)
Code Meaning
If the signal has the characteristic steadiness of crystal control, add the letter X to the RST report. If there is a chirp, the letter C may be added to so indicate. Similarly for a click, add K. The above reporting system is used on both cw and voice, leaving out the “tone” report on voice. Turn card over for examples.


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.


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.

[ TOP ]

ITU Phonetic Alphabet

Source: ARRL FSD-220 (1/04)
Word list adopted by the International Telecommunications Union, NATO, ICAO, and the FAA, in addition to, now, the ARRL
Letter Spoken Word
A Alfa
B Bravo
C Charlie
D Delta
E Echo
F Foxtrot
G Golf
H Hotel
I India
J Juliett
K Kilo
L Lima
M Mike
N November
O Oscar
P Papa
Q Quebec
R Romeo
S Sierra
T Tango
U Uniform
V Victor
W Wiskey
X X-ray
Y Yankee
Z Zulu

[ TOP ]

Home | Reference Index

Valid XHTML 1.1! | Valid CSS!

Revised: 9 January 2008
Copyright © 2005 - 2014
East Greenbush Amateur Radio Association
All Rights Reserved