Welcome to The Digital HAM
RigExpert is a USB-to-transceiver interface, which allows your PC to control your HAM Radio station through a single USB cable.
Using your software these interfaces will support modes like PSK-31
Elcom products can be used as a packet TNC or APRS trackers. They provide a USB connection to a computer for configuration and TNC operation.
Using software such as UIVIEW you can find the location of trackers in your area.