Advanced Qualification · A-006 Receivers · A-006-004-002
What does a product detector do?
- A It detects cross-modulation products
- B It mixes an incoming signal with a locally generated carrier
- C It provides local oscillations for input mixer
- D It amplifies and narrows band-pass frequencies
Correct answer: B — It mixes an incoming signal with a locally generated carrier. From the official ISED question bank, verified word for word.
Why
A product detector works by combining the incoming radio signal with a locally generated carrier wave inside the receiver. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.