G7C07 What is the simplest combination of stages that implement a superheterodyne receiver?
A. RF amplifier, detector, audio amplifier
B. RF amplifier, mixer, IF discriminator
C. HF oscillator, mixer, detector
D. HF oscillator, pre-scaler, audio amplifier
- By definition, a superheterodyne receiver must contain a mixer and a local oscillator. One additional stage, a detector, is necessary to recover the modulating audio. Thus, the simplest superheterodyne consists of a mixer, oscillator, and detector. Practical receivers add more amplifiers to improve sensitivity and filters to reject unwanted signals.