Basic Qualification · B-008 Interference and suppression · B-008-005-008
In a Field Day operation with separate transmitters assigned to specific bands, what type of filter is needed on the receivers to minimize interference?
- ABand-reject
- BBand-pass
- CLow-pass
- DHigh-pass
Correct answer: B — Band-pass. From the official ISED question bank, verified word for word.
Why
A Band-pass filter is the right choice because it acts like a gate that only lets the specific frequency you are trying to hear pass through while blocking all other signals from nearby transmitters on different bands. 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