Basic Qualification · B-002 Operating and procedures · B-002-007-003
Quel code Q doit-on employer pour vérifier si la fréquence est occupée avant d'émettre en code Morse?
- AQRZ?
- BQRL?
- CQRV?
- DQRU?
Correct answer: B — QRL?. Question tirée de la banque officielle d'ISDE.
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