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?
- ARéjecteur ("notch")
- BPasse-haut
- CPasse-bas
- 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