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Question 319

What type of modulation is used by FT8?

  1. 8-tone frequency shift keyingCorrect answer
  2. Vestigial sideband
  3. Amplitude compressed AM
  4. 8-bit direct sequence spread spectrum

Explanation

FT8 sends one of eight equally spaced tones per symbol, which is 8-tone frequency shift keying; the 8 in the mode name refers to that tone count.

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Question 319: What type of modulation is used by FT8? · FCC General Class (Element 3) · Questena