A new version of WSJT-X has been released.. See
http://physics.princeton.edu/pulsar/K1JT/wsjtx.html . As the webpage says:
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 plans
Plans call for future versions of WSJT-X to include the other popular modes
from WSJT: JT4,
ISCAT, and FSK441.
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