Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-003-006
What does a neutralizing circuit do in an RF amplifier?
- A It cancels the effects of positive feedback
- B It eliminates AC hum from the power supply
- C It reduces incidental grid modulation
- D It controls differential gain
Correct answer: A — It cancels the effects of positive feedback. From the official ISED question bank, verified word for word.
Why
A neutralizing circuit stops an RF amplifier from turning into an unwanted oscillator by cancelling the effects of positive feedback. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.