Advanced Qualification · A-006 Receivers · A-006-002-006
It is very important that the oscillators contained in a superheterodyne receiver are:
- Astable and sensitive
- Bselective and spectrally pure
- Cstable and spectrally pure
- Dsensitive 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 is section A-006 of the Advanced exam: Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.
Drill A-006 — free, no account