Advanced Qualification · A-002 Advanced components and circuits · A-002-012-007

A device which helps with receiver overload and spurious responses at VHF, UHF and above may be installed in the receiver front end. It is called a:

1. A helical resonator
2. B diplexer
3. C directional coupler
4. D duplexer

Correct answer: A — helical resonator. From the official ISED question bank, verified word for word.

Why

A helical resonator acts like a very selective filter placed right at the front of your receiver to block strong, unwanted signals that cause overload or spurious responses, especially at VHF, UHF and higher frequencies. The full explanation — and one for every question — is in Pro.

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Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.

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