Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-005
Quel type de circuit fait varier la syntonisation du circuit résonant parallèle d'un étage d'amplification pour produire la fréquence modulée (FM)?
- AUn modulateur équilibré
- BUn mélangeur doublement équilibré
- CUn modulateur audio
- DUn modulateur de phase
Correct answer: D — Un modulateur de phase. Question tirée de la banque officielle d'ISDE.
Why
A phase modulator creates frequency modulation by shifting the phase of the carrier wave in step with the audio signal, which effectively changes the frequency over time. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account