Basic Qualification · B-008 Interference and suppression · B-008-002-003
What sound is heard from a public address system if audio rectification of a nearby single-sideband transmission occurs?
- AClearly audible speech from the transmitter's signals
- BOn-and-off humming or clicking
- CA steady hum
- DDistorted speech from the transmitter's signals
Correct answer: D — Distorted speech from the transmitter's signals. From the official ISED question bank, verified word for word.
Why
When a strong single-sideband signal hits audio equipment, the circuit acts like a crude radio detector, pulling the voice information out of the radio wave. The full explanation — and one for every question — is in Pro.
Practise this section
Interference and suppression is section B-008 of the Basic exam: When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.
Drill B-008 — free, no account