Basic Qualification · B-008 Interference and suppression · B-008-001-011
You are experiencing interference in your VHF receiver. You have determined that signals from two nearby transmitters are mixing in your receiver to cause the interference. What device can you install to reduce the interference?
- ARF attenuator
- BNarrow band IF filter
- CSuitable filter at the receiver
- DCommon-mode choke
Correct answer: C — Suitable filter at the receiver. From the official ISED question bank, verified word for word.
Why
A suitable filter at the receiver blocks the specific unwanted frequencies causing the mixing while letting your desired signal pass through. 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