SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/hame-wspr-2min

How long is one WSPR transmitting period?

2 minutes, at random times.

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  1. 2 minutes ✔
  2. 15 seconds
  3. 10 minutes

Why: WSPR transmitting periods are 2 minutes long and occur randomly in time. It is a weak-signal beacon mode for checking propagation with very low power.

Huh, didn't know that: The WSJT-X guide gives 10.1387 and 14.0956 MHz as example active WSPR frequencies.

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References

Answer: 2 minutes. WSPR transmitting periods are 2 minutes long and occur randomly in time. It is a weak-signal beacon mode for checking propagation with very low power.

  1. WSJT-X User Guide 2.7.0, WSPR Mode wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0.html
    Transmitting periods are also 2 minutes duration
    Checked 2026-10-11.
  2. WSJT-X User Guide 2.7.0, WSPR Mode wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0.html
    for example, 10.1387 or 14.0956 MHz
    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
    E2E05 (A) Which of these digital modes does not support keyboard-to-keyboard operation? A. WSPR
    Checked 2026-10-11.

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