"If you are a licensed Amateur Radio (ham radio) operator, now you can communicate with other hams directly over the Internet, using streaming audio technology... This short book gives you a step-by-step walkthrough of all the options to set up your Echolink "Station." From registering your call sign with Echolink to installing the software on your PC, Android, or Apple device and making your first calls to individuals, ham repeaters, or conferences. "--