Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-007-001
Pour maintenir la puissance de sortie RF de crête d'un émetteur BLU à une valeur relativement constante, on utilise un circuit appelé :
- Acommande automatique de volume ("AVC")
- Bcommande automatique de niveau ("ALC")
- Ccommande automatique de gain ("AGC")
- Dcommande automatique de la sortie ("AOC")
Correct answer: B — commande automatique de niveau ("ALC"). Question tirée de la banque officielle d'ISDE.
Why
Automatic level control (ALC) keeps the peak radio frequency output of a single-sideband transmitter steady by reducing the audio input when the signal gets too loud, preventing distortion and protecting the final amplifier. 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