Advanced Qualification · A-006 Receivers · A-006-005-009
Poor frequency stability in a receiver usually originates in the:
- A mixer
- B local oscillator and power supply
- C detector
- D RF amplifier
Correct answer: B — local oscillator and power supply. From the official ISED question bank, verified word for word.
Why
Frequency stability depends on keeping the receiver's internal tuning signal steady, which is the job of the local oscillator. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.