Basic Qualification · B-002 Operating and procedures · B-002-005-010
When selecting a CW transmitting frequency, what minimum frequency separation from a contact in progress should you allow to minimize interference?
- A 150 Hz to 500 Hz
- B 5 Hz to 50 Hz
- C 1 kHz to 3 kHz
- D 3 kHz to 6 kHz
Correct answer: A — 150 Hz to 500 Hz. From the official ISED question bank, verified word for word.
Why
CW signals, which are Morse code sent as on-off radio tones, occupy a very narrow slice of the spectrum. 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.