Ham Radio signal "PSK31" at 18100.15 kHz

Strange Ham radio signal called PSK31, I am not really sure what it is. It is supposedly to be a computer-sound card-generated radioteletype mode, used primarily by amateur radio operators. Here is the signal I found at 18100.15 kHz recorded at my place in Montreal, Quebec, Canada. Using FastStone Screen Capture.

More info about PSK31 here: https://en.wikipedia.org/wiki/PSK31
Kiwisdr: https://kiwisdr.com/public/
FastStone Screen Capture: https://www.fastston.org

Видео Ham Radio signal "PSK31" at 18100.15 kHz канала edna4everluv