Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-005-009
Lorsqu'on utilise certains excursiomètres ("deviation meter"), il est important de connaître :
- Ala bande passante du filtre FI
- Bla fréquence de modulation et l'indice de modulation
- Cl'indice de modulation
- Dla fréquence de modulation
Correct answer: B — la fréquence de modulation et l'indice de modulation. Question tirée de la banque officielle d'ISDE.
Why
Some deviation meters calculate how much the carrier frequency swings by using a formula that requires both the modulating frequency and the modulation index. 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