Basic Qualification · B-002 Operating and procedures · B-002-004-001
What should you do before you transmit on any frequency?
- A Make sure the SWR on your transmission line is high enough
- B Increase power to ensure someone will hear you
- C Listen to make sure others are not using the frequency
- D Check your antenna for resonance at the selected frequency
Correct answer: C — Listen to make sure others are not using the frequency. From the official ISED question bank, verified word for word.
Why
Before sending any signal, you must listen first to ensure no one else is already using that frequency, because sharing the airwaves requires courtesy and prevents your transmission from crashing into another conversation. 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.