Advanced Qualification · A-006 Receivers · A-006-004-003
Distortion in a receiver that only affects strong signals usually indicates a defect in or mis-adjustment of the:
- A IF amplifier
- B AF amplifier
- C RF amplifier
- D automatic gain control (AGC)
Correct answer: D — automatic gain control (AGC). From the official ISED question bank, verified word for word.
Why
Automatic gain control (AGC) is the circuit designed to keep audio levels steady by lowering the receiver's sensitivity when a strong signal arrives. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.