Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-001-003
How is positive feedback coupled to the input in a Pierce oscillator?
- A Through link coupling
- B Through a tapped coil
- C Through capacitive coupling
- D Through a neutralizing capacitor
Correct answer: C — Through capacitive coupling. From the official ISED question bank, verified word for word.
Why
In a Pierce oscillator, the crystal acts like a tiny, precise filter that needs a push to keep vibrating. 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.