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Frage 202

What is reciprocal mixing?

  1. Two out-of-band signals mixing to generate an in-band spurious signal
  2. In-phase signals cancelling in a mixer resulting in loss of receiver sensitivity
  3. Two digital signals combining from alternate time slots
  4. Local oscillator phase noise mixing with adjacent strong signals to create interference to desired signalsRichtige Antwort

Erklärung

Reciprocal mixing is the translation of the local oscillator's phase noise into the IF passband by a strong nearby signal, which raises the apparent noise floor whenever that signal is present. The cause is the oscillator's own spectral impurity, not two out-of-band signals combining or phase cancellation in a mixer.

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Frage 202: What is reciprocal mixing? · FCC Amateur Extra Class (Element 4) · Questena