Basic Qualification · B-008 Interference and suppression · B-008-001-001
What is the cause of receiver overload?
- A Overmodulation of a transmitter
- B Very strong signal from a transmitter
- C Frequency instability of a transmitter
- D Parasitic oscillations in a transmitter
Correct answer: B — Very strong signal from a transmitter. From the official ISED question bank, verified word for word.
Why
Receiver overload happens when a nearby transmitter sends a signal so powerful that it overwhelms the sensitive circuits inside your radio, much like shouting too close to someone's ear makes it impossible to hear a whisper. 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.