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 online WSJT-X User's Guide.
Future plansPlans call for future versions of WSJT-X to include the other popular modes from WSJT: JT4, ISCAT, and FSK441.
Latest WSJT-X User's Guide
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.
Macintosh OS X: Thanks to G4KLA: