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SESK: Stuff Everyone Should Know · sesk.info/hame-q65-fast-fading

The Q65 mode is designed for which kind of signal conditions?

Fast-fading scatter paths.

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  1. Fast-fading paths such as tropospheric, rain and ionospheric scatter ✔
  2. Strong, steady local ground-wave signals
  3. Satellite downlinks with no fading at all

Why: The WSJT-X guide says Q65 is designed for fast-fading signals such as tropospheric, rain and ionospheric scatter. It also works well for EME and trans-equatorial paths.

Huh, didn't know that: Q65 can average several repeated transmissions to decode signals too weak for a single try.

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References

Answer: Fast-fading paths such as tropospheric, rain and ionospheric scatter. The WSJT-X guide says Q65 is designed for fast-fading signals such as tropospheric, rain and ionospheric scatter. It also works well for EME and trans-equatorial paths.

  1. WSJT-X User Guide 2.7.0, Q65 wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0.html
    Q65 is designed for fast-fading signals
    Checked 2026-10-11.
  2. WSJT-X User Guide 2.7.0 wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0.html
    JT4, JT65, and Q65 offer Message Averaging
    Checked 2026-10-11.
  3. NCVEC 2024-2028 Amateur Extra Class Question Pool www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    E2D03 (D) Which of the following digital modes is designed for EME communications? A. MSK144 B. PACTOR III C. WSPR D. Q65
    Checked 2026-10-11.

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