Basic Qualification · B-002 Operating and procedures · B-002-007-003
What is the proper Q code to use to see if a frequency is in use before transmitting on CW?
- AQRU?
- BQRZ?
- CQRL?
- DQRV?
Correct answer: C — QRL?. From the official ISED question bank, verified word for word.
Why
You use "QRL?" to ask if a frequency is busy before sending Morse code, which prevents your signal from interfering with others already talking. The full explanation — and one for every question — is in Pro.
Practise this section
Operating and procedures is section B-002 of the Basic exam: How to operate: calling, phonetics, Q-signals, repeaters, nets, emergency traffic, and the courtesies that keep a band usable.
Drill B-002 — free, no account