Advanced Qualification · A-006 Receivers · A-006-002-006
Il est très important que les oscillateurs utilisés dans un récepteur superhétérodyne :
- Asoient sensibles et sélectifs
- Bsoient stables et sensibles
- Csoient sélectifs et produisent un spectre pur
- Dsoient stables et produisent un spectre pur
Correct answer: D — soient stables et produisent un spectre pur. Question tirée de la banque officielle d'ISDE.
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