Basic Qualification · B-008 Interference and suppression · B-008-005-010
Votre station 2 mètres subit une surcharge de récepteur provoquée par plusieurs émetteurs du service mobile terrestre exploités sur des bandes adjacentes. Quel type de filtre pourrait aider?
- APasse-bande
- BPasse-bas
- CPasse-haut
- DRéjecteur ("notch")
Correct answer: A — Passe-bande. Question tirée de la banque officielle d'ISDE.
Why
A Band-pass filter lets only the specific range of frequencies your station uses pass through while blocking signals that are too low or too high. 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