WSJT-X implements JT9, a new mode designed especially for the LF, MF, and HF bands, as well as the popular mode JT65. Both modes were designed for making reliable, confirmed QSOs under extreme weak-signal conditions. They use nearly identical message structure and source encoding. JT65 was designed for EME (“moonbounce”) on the VHF/UHF bands and has also proved very effective for worldwide QRP communication at HF; in contrast, JT9 is optimized for HF and lower frequencies. JT9 is about 2 dB more sensitive than JT65A while using less than 10% of the bandwidth. World-wide QSOs are possible with power levels of a few watts and compromise antennas. A 2 kHz slice of spectrum is essentially full when occupied by ten JT65 signals. As many as 100 JT9 signals can fit into the same space, without overlap.
WSJT-X offers a "bi-lingual" operating mode in which you can transmit and receive JT65 and JT9 signals, switching between modes automatically as needed. Displayed bandwidth can be as large as 5 kHz. If your receiver has as upper-sideband filter at least 4 kHz wide, you can have all the typical JT65 and JT9 activity on screen at once, available for making QSOs with a click of the mouse. Even with standard SSB-width IF filters, switching between JT65 and JT9 modes is quick and convenient. Be sure to read the Version 1.1 User's Guide before using these new features.
Future plansPlans call for future versions of WSJT-X to include also the most popular modes from WSJT: JT4, ISCAT, and FSK441.
DownloadsWSJT-X Version 1.1 installation packages:
1. If you have not obtained packages from this PPA (Personal Package Archive) before:
$ sudo add-apt-repository ppa:jnogatch/wsjtx
2. To obtain the latest version from this PPA:
$ sudo apt-get update $ sudo apt-get install wsjtx
3. You should also download kvasd and put it in the same directory as executable binaries wsjtx and jt9. Normally (after running the script /usr/bin/wsjtx once) this directory will be $HOME/.wsjtx.