RF signal monitoring and surveillance applications have special equipment requirements that often go well beyond the typical radio receiver or spectrum analyzer. The Real-Time Spectrum Analyzer (RTSA) has many superior capabilities for signal monitoring and spectrum management uses. This application note demonstrates how the performance and features of the Tektronix RSA3000B Series instruments, and particularly the signal discovery power of Tektronix DPX™ technology, are focused on spectrum management. We will particularly examine Digital Phosphor (DPX) displays as they reveal time-varying signals.