Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-009-006
Avec la technique d'étalement du spectre ("spread spectrum"), quel type de signal produit un changement prédéterminé dans la porteuse?
- ABruit quantifié
- BSéquence aléatoire de bruit
- CSéquence binaire pseudo-aléatoire
- DSéquence avec compression-extension de fréquence
Correct answer: C — Séquence binaire pseudo-aléatoire. Question tirée de la banque officielle d'ISDE.
Why
A pseudo-random sequence is a specific pattern that looks random but repeats after a set time, allowing both the sender and receiver to synchronize and decode the spread spectrum signal correctly. 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