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Question 411

Which method generates an SSB signal using digital signal processing?

  1. Mixing products are converted to voltages and subtracted by adder circuits
  2. A frequency synthesizer removes unwanted sidebands
  3. Varying quartz crystal characteristics are emulated in digital form
  4. Signals are combined in quadrature phase relationshipCorrect answer

Explanation

The DSP phasing method takes the audio and its 90-degree-shifted copy and modulates two carriers that are themselves 90 degrees apart. When the two products are combined, one sideband adds while the other cancels, leaving a single sideband without a sharp filter.

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Question 411: Which method generates an SSB signal using digital signal… · FCC Amateur Extra Class (Element 4) · Questena