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:
- Ahelical resonator
- Bdiplexer
- Cdirectional coupler
- Dduplexer
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.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account