Advanced Qualification · A-006 Receivers · A-006-002-011
The mixer stage of a superheterodyne receiver:
- A demodulates SSB signals
- B produces an intermediate frequency
- C produces spurious signals
- D acts as a buffer stage
Correct answer: B — produces an intermediate frequency. From the official ISED question bank, verified word for word.
Why
The mixer stage takes the incoming radio signal and mixes it with a local oscillator signal to create a new, fixed frequency called the intermediate frequency, which is easier for the rest of the receiver to process. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.