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New 'Pre-Release' Version of WSJT-X Includes FT8 Changes:

from The ARRL Letter on September 7, 2017
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New 'Pre-Release' Version of WSJT-X Includes FT8 Changes:

A new "pre-release" version of WSJT-X https://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html now is available. This is the Amateur Radio digital software suite developed by Joe Taylor, K1JT, that includes the increasingly popular FT8 mode. The September 2 release, WSJT-X version 1.8.0-rc2, fixes a number of issues, provides better performance, and offers some new features.

"Implementation of FT8 and its auto-sequencing feature is now more capable and more polished," Taylor said in the release notes. "The decoder is faster and better. It now includes signal subtraction, multi-pass decoding, and the use of accumulated 'a priori' information as a QSO progresses. Sensitivity extends downward as far as -24 dB in some circumstances."

Taylor said that overlapping signals "two and three deep" are frequently decoded at essentially the same frequency, and on a crowded band "we sometimes see more than 30 decodes in a single 15-second interval over a 2 kHz window." In addition, the North American VHF Contesting Mode has been expanded to include both FT8 and MSK144 modes, and the WSJT-X User Guide has been extensively updated.

"Depending on what code revision you upgrade from, it may be necessary to do a one-time reset of the default list of suggested operating frequencies," Taylor pointed out. Some new features have been discussed in the WSJT Meteor Scatter and Weak Signal Group https://groups.yahoo.com/neo/groups/wsjtgroup/info.

Digital modes such as JT65 and FT8 require that your computer's internal time clock be set precisely. If your computer's clock is off by more than 1 or 2 seconds, contacts may be difficult or impossible. Internet time synchronization may be sufficient. The WSJT-X documentation recommends using Meinberg NTP http://www.meinbergglobal.com/english/sw/ntp.htm on Windows machines to synchronize with internet time servers.

Logbook of The World (LoTW http://www.arrl.org/logbook-of-the-world) now supports the upload of FT8 contacts after a TQSL configuration file update, which was released shortly after the mid-August debut of the new ADIF standard (version 3.0.6 http://adif.org/306/ADIF_306.htm) with support for FT8. -- Thanks to the ARRL Contest Update http://www.arrl.org/the-arrl-contest-update

Source:

The ARRL Letter

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