The WSJT-X Development Group has announced that a new beta version of the FT4 protocol now is available for testing in WSJT-X 2.1.0-rc6. The FT4 included in this “release candidate 6” version is not compatible with any previous release.
“Therefore, please stop using WSJT-X 2.1.0-rc5,” the announcement said. “If you wish to use FT4 after today (June 2) or to take advantage of other recent program…
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Source: ARRL