Amateur Extra Class: 2020–2024
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E2E09:

Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?

  1. RTTY
  2. PACTOR
  3. MT63
  4. PSK31
E2E01 E2E02 E2E03 E2E04 E2E05 E2E06 E2E07 E2E08 E2E09 E2E10 E2E11 E2E12 E2E13