Advanced Qualification · A-006 Receivers · A-006-001-005
A multiple conversion superheterodyne receiver is more susceptible to spurious responses than a single-conversion receiver because of the:
- A AGC being forced to work harder causing the stages concerned to overload
- B additional oscillators and mixing frequencies involved in the design
- C poorer selectivity in the IF caused by the multitude of frequency changes
- D greater sensitivity introducing higher levels of RF to the receiver
Correct answer: B — additional oscillators and mixing frequencies involved in the design. From the official ISED question bank, verified word for word.
Why
A multiple conversion superheterodyne receiver uses more than one local oscillator and mixer stage to shift the incoming signal to intermediate frequencies. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.