Advanced Qualification · A-002 Advanced components and circuits · A-002-011-003
Pour une émission à bande latérale unique en phonie, que devrait être la largeur de bande d'un bon filtre en treillis à quartz ("lattice filter")?
- A6 kHz
- B2,4 kHz
- C15 kHz
- D500 Hz
Correct answer: B — 2,4 kHz. Question tirée de la banque officielle d'ISDE.
Why
A good crystal lattice filter for single-sideband phone passes just enough audio to make speech clear while blocking unwanted signals, which requires a width of about 2.4 kHz. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account