It uses a transmission mode called MEPT-JT.
WSPR is a software application written by Joe Taylor, K1JT, a Nobel Prize-winning Princeton physicist. WSPR stands for Weak Signal Propagation Reporter, but it's pronounced "Whisper" - quite an appropriate name as it is all about sending and receiving signals that are barely audible. You can analyze past signal reports to see the effect of seasonal propagation changes or antenna improvements. If you left WSPR running while you were doing something else, you can also search the database to find out later where your signals were received during the day. Because participating stations usually upload spots that they receive in real time to a web server, you can find out within seconds of the end of each transmission exactly where and how strongly it was received, and even view the propagation paths on a map. It enables your radio transceiver to transmit beacon signals, and to receive beacon signals from similarly-equipped stations in the same amateur band. WSPR is a piece of software that enables you to participate in a world-wide network of low power propagation beacons.
If this is an aspect of radio that fascinates you, then you'll enjoy using WSPR. Short wave radio propagation is never completely predictable, and can often surprise you. One of the things that makes communicating with amateur radio more fun than using the Internet or the phone is that you never know where your signals will be received.
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