Advanced Qualification · A-006 Receivers · A-006-002-006
It is very important that the oscillators contained in a superheterodyne receiver are:
- A stable and sensitive
- B selective and spectrally pure
- C stable and spectrally pure
- D sensitive and selective
Correct answer: C — stable and spectrally pure. From the official ISED question bank, verified word for word.
Why
Oscillators in a superheterodyne receiver must stay on their assigned frequency without drifting, which means they need to be stable, and they must produce a clean signal without extra unwanted frequencies, meaning they must be spectrally pure. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.