WSJT-X is a computer program which implements communication protocols or "modes" called FT8, JT4, JT9, JT65, QRA64, ISCAT, MSK144, and WSPR, as well as one called Echo for detecting and measuring your own radio signals reflected from the Moon. These modes were all designed for making reliable, confirmed QSOs under extreme weak-signal conditions.
WSJT-X can receive and decode WSPR signals and upload the results to wsprnet.org.
And it can transmit your WSPR signal.
After 15 minutes of experimenting with the program this are the receive results. Not bad...
After one TX cycle with 5W (the minimum power of FT-991A) this is the result. Antenna 80m inverted V wire (Fan) dipole.
WSJT-X allows RX-only, TX-only and RX/TX mixed. Default is a 20% TX percentage. In the picture below the result of mixed RX/TX mode. Click in the WSPRnet.org map on a station and it shows whether it received your signal or is received by you or both. Nice feature.