Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-003-007
Dans un émetteur, pourquoi neutraliser l'étage final d'amplification?
- APour éliminer les oscillations parasites
- BPour limiter l'indice de modulation
- CPour couper l'amplificateur de puissance pendant les périodes d'attente
- DPour garder la porteuse sur la fréquence
Correct answer: A — Pour éliminer les oscillations parasites. Question tirée de la banque officielle d'ISDE.
Why
Neutralizing the final amplifier stops unwanted high-frequency signals, called parasitic oscillations, from building up inside the transmitter. 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