Essential Q-Codes and Procedural Signals (Prosigns) in Amateur Radio
To establish fast, clear, and unambiguous communications across amateur bands — especially in Morse code (CW) and digital modes — radio operators use standardized **Q-codes** and **procedural signs (prosigns)**. Proper mastery of these signals is a cornerstone of proficient operating practice.
1. Core Q-Codes and Procedural Signals
| Code / Prosign | Meaning and Correct Application |
|---|---|
| AR | End of Transmission: Indicates the end of a transmission not addressed to a specific station (e.g., following a general CQ call). Sent concatenated. |
| K | Over: End of current turn, inviting any listening station to transmit. |
| KN | Over Specifically: End of turn, explicitly inviting only the designated station to reply. Indicates that outside stations should not break in. |
| SK | End of Contact (Silent Key / End of QSO): Final sign-off signal marking the conclusion of a contact between stations. Sent concatenated. |
| CL | Closing Station: Final transmission made prior to shutting down the station and going off the air. Sent concatenated. |
| QRL? | Is the frequency in use?: Mandatory query transmitted prior to calling CQ on a new frequency. |
| QRZ? | Who is calling me?: Used exclusively to ask which station called your callsign. Note: QRZ has no other meaning! |
| QRS | Send Slower: Procedural request asking the other operator to reduce transmission speed. |
| AS | Stand By / Wait: Temporary pause during transmission requiring brief waiting. Sent concatenated. |
| = (BT) | Break / Separator: Used as a thought-pause character while keeping the line open, or as a section separator in text messages. |
Technical Note on Prosigns: Procedural prosigns (such as
AR, SK, CL, AS, BT) are sent in Morse code without character spacing between letters, forming a single continuous rhythm.
