ThrobX-4 - a Digital Mode for Amateur Radio

Today I was playing around with digital modes on 20 meters and decided that the rather salaciously-named 'ThrobX-4' deserved a video. Here is one transmission of a CQ call. Software is Ham Radio Deluxe/Digital Master running on a Windows 10 virtual machine via Parallels Desktop on my MacBook Pro. Modulator is a SignaLink USB, radio transceiver is a Yaesu FT-891, and antenna is a 35' end-feed wire.
It's a rather extravagant and supremely geeky way to text with people around the world without having to go through any commercial networks.