Advanced Qualification · A-006 Receivers · A-006-001-002
What factors should be considered when selecting an intermediate frequency?
- A Image rejection and responses to unwanted signals
- B Noise figure and distortion
- C Interference to other services
- D Cross-modulation distortion and interference
Correct answer: A — Image rejection and responses to unwanted signals. From the official ISED question bank, verified word for word.
Why
The intermediate frequency is chosen primarily to stop the receiver from hearing a mirror image of the desired signal and to block other unwanted signals that might slip through. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.