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WSJT -X Version 1.9.0

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    WSJT -X Version 1.9.0

    The WSJT Development Group is pleased to announce a Release Candidate of WSJT-X Version 1.9.0.
    This is a second beta release, so it's called v1.9.0-rc2. A first candidate release, v1.9.0-rc1, has already been tested in the field by a small test group. A General Availability (GA) release of v1.9.0 will be announced at a suitable time in the near future. After that time you should no longer use any -rc# candidate.

    Here’s a short list of features and capabilities added to WSJT-X since Version 1.8.0:

    1. New FT8 DXpedition Mode to facilitate high QSO rates in pileup situations

    2. Decoding improvements for JT65 mode, including a priori (AP) decoding when VHF/UHF/Microwave features are enabled

    3. Optional Auto-Sequencing in JT4, JT9, and JT65 when VHF/UHF/Microwave features are enabled

    4. Better suppression of low-confidence false decodes generated by AP decoding in FT8 mode

    5. Improved decoding performance for WSPR mode, especially effective at LF and MF

    6. Minor adjustments to auto-sequencing behavior

    7. More flexible Doppler control features for EME

    8. Improved waterfall sensitivity for very weak signals

    9. Automatic real-time forwarding of logged information to N1MM Logger+

    10. Expanded and improved UDP messages sent to companion programs

    11. Bug fixes and other minor tweaks to user interface
    Public Test of FT8 DXpedition Mode

    A primary purpose of this beta release is to allow field testing of FT8 DXpedition Mode. If you decide to install v1.9.0-rc2, please help us by participating in a public test run scheduled for March 6-7 (evening of March 6, NA time). The goal is to simulate a rare-DXpedition pileup by having many stations ("Hounds") calling and trying to work a designated pseudo-DXpedition station ("Fox"). Note that everyone participating in the test MUST use WSJT-X v1.9.0-rc2. In addition, you must read and carefully follow the instructions posted here:

    Reading the instructions for FT8 DXpedition Mode is very important!

    If you have legitimate access to more than one callsign (XYL, club call, or whatever) please feel free to call and work the Fox more than once. We want the test pileup to be as deep as possible.

    The scheduled test will take place as follows:
    Date UTC Frequency

    Mar 6 2300 14.080 MHz
    Mar 7 0000 10.141
    Mar 7 0100 7.080
    Mar 7 0200 3.585

    The indicated USB dial frequencies are subject to change, depending on other band usage at the time. If last-minute instructions are necessary they will be posted here:

    Note that the dial frequencies are NOT the conventional FT8 operating frequencies for each band. DXpedition Mode should NOT be used on standard FT8 operating frequencies.

    Of course you may also choose to do your own testing of FT8 DXpedition Mode together with a group of colleagues. One station would act as Fox, the others as Hounds. In such tests the Fox will be limited to using a single Tx "slot".

    Installation packages for Windows, Linux, Macintosh, and Raspian Jessie have been posted on the WSJT web site here:
    Scroll down to the bottom of the page to find a link to the installation package for your system.

    You can also download the packages from our SourceForge site:

    Please report any problems to email list
    You must be a subscriber in order to post there.

    73 from Joe, K1JT, for the WSJT Development Group
    73 Al 4L5A