Basic Qualification · B-008 Interference and suppression · B-008-005-011
Un filtre atténue les fréquences supérieures à sa fréquence de coupure de 40 MHz. De quel type de filtre s'agit-il?
- APasse-bas
- BPasse-bande
- CPasse-haut
- DRéjecteur ("notch")
Correct answer: A — Passe-bas. Question tirée de la banque officielle d'ISDE.
Why
A low-pass filter lets signals below a set limit pass through while blocking those above it. 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