Basic Qualification · B-008 Interference and suppression · B-008-005-006
Vous devez installer un filtre de secteur CA pour réduire le bruit radioélectrique entendu dans l'équipement de votre station. Quel doit être sa réponse en fréquence?
- ACoupe-bande
- BPasse-bas
- CPasse-haut
- DPasse-bande
Correct answer: B — Passe-bas. Question tirée de la banque officielle d'ISDE.
Why
A Low-pass filter is the right choice because it lets your normal 50 or 60 hertz power frequency pass through to your equipment while blocking the much higher radio frequency noise that causes interference. 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