Basic Qualification · B-001 Regulations and policies · B-001-019-003
Amateur radio stations are required to have means of indicating or preventing a signal quality problem unique to voice transmissions. What is it?
- A Inadequate pre-emphasis
- B Inadequate audio filtering
- C Overmodulation
- D Excessive compression
Correct answer: C — Overmodulation. From the official ISED question bank, verified word for word.
Why
Overmodulation happens when you speak too loudly or push the microphone gain too high, causing the radio signal to distort and spread into frequencies used by other services. The full explanation — and one for every question — is in Pro.
Practise this section
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.