Basic Qualification · B-003 Station assembly, practice and safety · B-003-005-007
In an SSB/CW receiver, what is the purpose of the product detector?
- A For SSB reception, reject the unwanted sideband
- B Convert audio frequency electrical signals into sound
- C Detect frequency drift to control the local oscillator
- D Recover the transmitted modulation
Correct answer: D — Recover the transmitted modulation. From the official ISED question bank, verified word for word.
Why
The product detector mixes the incoming radio signal with a locally generated tone to recreate the original audio, effectively recovering the transmitted modulation that was stripped away during transmission. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.