Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-003-011
Parasitic oscillations in an RF power amplifier may be caused by:
- A overdriven stages
- B poor voltage regulation
- C excessive harmonic production
- D lack of neutralization
Correct answer: D — lack of neutralization. From the official ISED question bank, verified word for word.
Why
Parasitic oscillations are unwanted high-frequency signals that sneak into an amplifier because energy from the output feeds back to the input, and a lack of neutralization means the circuit lacks the specific wiring needed to cancel this 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.