Basic Qualification · B-001 Regulations and policies · B-001-019-004
What is the maximum percentage of modulation permitted for amateur radio voice communications?
- A50%
- B90%
- C100%
- D75%
Correct answer: C — 100%. From the official ISED question bank, verified word for word.
Why
Voice signals in amateur radio use amplitude modulation, where the carrier wave's strength varies to carry sound. The full explanation — and one for every question — is in Pro.
Practise this section
Regulations and policies is section B-001 of the Basic exam: The rules: who may operate, what the certificate allows, station identification, third-party traffic, what you may and may not transmit, and how ISED regulates the amateur service.
Drill B-001 — free, no account