9 Electronic systems and software that perform digital signal processing, command and control, radio signal receipt, digitization, storage, processing, and analysis of radio signal data, signals intelligence namely, locating the source of radio signals, intercepting and decoding radio signals, and geolocation; RF amplifiers, radio systems and antennas; digital-to-analog and analog-to-digital converters; Field-programmable gate arrays (FPGAs); software defined radios