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E2E03:To what does the "4" in FT4 refer?

E2E03E2E

To what does the "4" in FT4 refer?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E2E03 is Four-tone continuous-phase frequency shift keying.

The key fact is Four-tone continuous-phase frequency shift keying. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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