Advanced Qualification · A-006 Receivers · A-006-001-004
In a communications receiver, a crystal filter would be located in the:
- A IF circuits
- B local oscillator
- C audio output stage
- D detector
Correct answer: A — IF circuits. From the official ISED question bank, verified word for word.
Why
A crystal filter belongs in the IF circuits because that is where the radio converts the incoming signal to a fixed, lower frequency to make it easier to separate the desired station from others. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.