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In high-level modulation, the message is applied to

  • A.The first low-level stage
  • B.The antenna coupling network
  • C.The final power amplifier
  • D.The master oscillator

Answer: C

High-level modulation varies the supply to the final stage, so every stage before it handles an unmodulated carrier and can run in efficient class C. That is the classic broadcast arrangement. Modulating the oscillator would produce frequency rather than amplitude modulation and would destabilise it. Modulating the first stage is low-level modulation, which then forces linear amplification downstream. And the coupling network is passive. Where the modulation is injected decides the efficiency of the whole chain.

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