Basic Qualification · B-008 Interference and suppression · B-008-002-011
Stereo amplifiers often have long leads that pick up transmitted signals because they act as:
- Aparasitic elements
- Bresonant circuits
- Cfrequency discriminators
- Dreceiving antennas
Correct answer: D — receiving antennas. From the official ISED question bank, verified word for word.
Why
Long wires connected to stereo amplifiers act as receiving antennas because they are the right size to catch radio waves from nearby transmitters and turn them into unwanted electrical signals that create noise. 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