This manual provides detailed instructions for using the Elad FDM-77 SDR receiver. The FDM-77 is a software-defined radio receiver that consists of a hardware RF front-end and a PC running the Elad software radio. The software radio is the operator's primary interface (GUI) for controlling the radio (input, tuning, setup, mode, display, and AF) and is also used to decode and reproduce audio through the PC soundcard.