Basic Qualification · B-008 Interference and suppression · B-008-005-001
What is the frequency response of an ideal notch filter?
- A Attenuate all frequencies except one single frequency
- B Attenuate all frequencies except a range of frequencies
- C Attenuate one frequency and pass all others
- D Attenuate a range of frequencies and pass all others
Correct answer: C — Attenuate one frequency and pass all others. From the official ISED question bank, verified word for word.
Why
An ideal notch filter acts like a very narrow trap that removes just one specific frequency, such as a strong interfering tone, while letting every other signal pass through unchanged. The full explanation — and one for every question — is in Pro.
Practise this section
When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.