AR - ---------End of message

AS - ---------Stand by

B K - --------Invite receiving station to transmit

BT - ---------Pause; Break For Text

C L - --------Going off the air (clear)

C Q - --------Calling any amateur radio station

K - ----------Go, invite any station to transmit

KN - ---------Go only, invite a specific station to transmit

R - ----------All received OK

SK - ---------End of contact (sent before call)

CW ABBREVIATIONS

The RST System

 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 

INTERNATIONAL EXTENSIONS AND ABBREVIATED NUMBERS

 





INTERNATIONAL Extensions

`A     *--*-

:A     *-*-

`E     **-**

~N     --*--

:U     **--

:O     ---*

!      -*-*--

CH or Bar-H   ----



Abbreviated Numbers

1   *-      6   -***

2   **-     7   --*

3   *--     8   -**

4   ***-    9   -*

5   ***    10   -