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?

1. A QRU?
2. B QRZ?
3. C QRL?
4. D QRV?

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

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 · All B-002 questions