Basic Qualification · B-008 Interference and suppression · B-008-002-008
Quel dispositif peut-on utiliser pour minimiser les effets de la radiofréquence captée par les fils audio raccordés aux hautparleurs stéréo, aux amplificateurs d'interphone, aux appareils téléphoniques, etc.?
- AUn parasurtenseur
- BUne bobine sur noyau de ferrite
- CUn filtre passe-haut
- DUn atténuateur
Correct answer: B — Une bobine sur noyau de ferrite. Question tirée de la banque officielle d'ISDE.
Why
A coil on ferrite core works by wrapping the audio wire around a special iron-like bead that acts as a trap for unwanted radio frequency energy, stopping it from turning into noise in your speakers or phones. 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