Advanced Qualification · A-006 Receivers · A-006-004-009
AGC is derived in a receiver from one of two circuits. Depending on the method used, it is called:
- A RF derived or audio derived
- B IF derived or RF derived
- C detector derived or audio derived
- D IF derived or audio derived
Correct answer: D — IF derived or audio derived. From the official ISED question bank, verified word for word.
Why
Automatic Gain Control (AGC) keeps your receiver's volume steady by adjusting amplification based on signal strength, and it gets this strength information from either the intermediate frequency stage or the audio stage. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.