Basic Qualification · B-008 Interference and suppression · B-008-001-004
Quel genre de filtre doit-on brancher au téléviseur afin de tenter de prévenir une surcharge du récepteur causée par l'émetteur HF du radioamateur?
- APasse-bande
- BFiltre de secteur CA
- CPasse-haut
- DPasse-bas
Correct answer: C — Passe-haut. Question tirée de la banque officielle d'ISDE.
Why
A high-pass filter blocks low frequencies while letting high ones through, which is exactly what a television needs to stop strong amateur radio HF signals from overloading its front end. 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