Advanced Qualification · A-006 Receivers · A-006-002-007

In a superheterodyne receiver, a stage before the IF amplifier has a variable capacitor in parallel with a trimmer capacitor and an inductance. The variable capacitor is for:

1. A tuning of the local oscillator (LO)
2. B tuning both the antenna and the BFO
3. C tuning of the beat-frequency oscillator (BFO)
4. D tuning both the antenna and the LO

Correct answer: A — tuning of the local oscillator (LO). From the official ISED question bank, verified word for word.

Why

In a superheterodyne receiver, the local oscillator generates a signal that mixes with the incoming radio wave to create a fixed intermediate frequency. The full explanation — and one for every question — is in Pro.

Practise this section

Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.

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