SignalPrep
Basic Qualification · B-008 Interference and suppression · B-008-005-002

Un filtre atténue les fréquences inférieures à sa fréquence de coupure de 60 MHz. De quel type de filtre s'agit-il?

  1. ARéjecteur ("notch")
  2. BPasse-haut
  3. CPasse-bas
  4. DPasse-bande

Correct answer: B — Passe-haut. Question tirée de la banque officielle d'ISDE.

Why

A High-pass filter is correct because it blocks or weakens signals below a set point while letting higher frequencies pass through. The full explanation — and one for every question — is in Pro.

Practise this section

Interference and suppression is section B-008 of the Basic exam: When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.

Drill B-008 — free, no account

This question in English · All B-008 questions