The Basic lessons · Operating and procedures · B-002-007

Mastering Q Codes for Clear Communication

Learn the essential three-letter Q codes that help operators manage signal speed, frequency changes, and interference. This lesson explains how to ask if a frequency is busy, request slower sending, and identify callers using standard shorthand.

This lesson is part of SignalPrep Pro. The subsection's 11 exam questions are free to practise: practise B-002-007.

What this subsection asks

• What does the code "QRS" mean in amateur radio?
• What does the code "QTH" mean in amateur radio?
• What is the proper Q code to use to see if a frequency is in use before transmitting on CW?
• What does the code "QSY" mean in amateur radio?
• SOS CQD What does the code "QSB" mean in amateur radio?
• What is the correct Q code to ask who is calling you?
• What does the code "QRM" mean in amateur radio?
• What does the code "QRN" mean in amateur radio?
• What is the Q code indicating that you want the other station to send slower?
• What is the Q code that means "Who is calling me?" in amateur radio?
• What is the Q code that means "I will call you again" in amateur radio?