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Which instrument confirms that a transmitter's modulation is within limits?

  • A.A frequency counter
  • B.A dummy load
  • C.A modulation monitor
  • D.A standing wave ratio bridge

Answer: C

A modulation monitor displays or measures the depth and flags peaks beyond the permitted index, which is what keeps a station legal and out of its neighbours' channels. A standing wave bridge checks the antenna match. A counter checks frequency. And a dummy load absorbs power for testing. Each instrument answers one question, and choosing the right one is half of any measurement task.

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