Basic Qualification · B-008 Interference and suppression · B-008-003-003
Si votre émetteur rayonne des signaux hors de la bande où vous émettez, comment appelle-t-on ces émissions?
- ADes rayonnements non essentiels
- BDes tonalités secondaires
- CDes pépiements ("chirp")
- DDes émissions hors fréquences
Correct answer: A — Des rayonnements non essentiels. Question tirée de la banque officielle d'ISDE.
Why
Spurious emissions are unwanted signals your transmitter sends outside its assigned band, often caused by poor filtering or circuit instability. 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