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Question 305

What is the phase difference between the I and Q RF signals that software-defined radio (SDR) equipment uses for modulation and demodulation?

  1. Zero
  2. 90 degreesCorrect answer
  3. 180 degrees
  4. 45 degrees

Explanation

I and Q stand for in-phase and quadrature, and quadrature means 90 degrees of phase difference. That perpendicular pair is exactly what lets amplitude and phase be represented independently by two numbers.

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Question 305: What is the phase difference between the I and Q RF signals… · FCC General Class (Element 3) · Questena