The HP / Agilent E4423B ESG-AP Series Analog RF Signal Generator provides outstanding phase-noise performance and analog modulation features for all general-purpose test needs. The E4423B offers excellent performance with superior quality, reliability and worldwide support -- at an affordable price. The E4423B provides comprehensive analog modulation capabilities, including AM, FM, phase modulation and pulse modulation. It is ideally suited to meet the demanding requirements of today's receiver test, component test and local oscillator application. Additional E4423B Features: High spectral purity, Flexible architecture with upgrade paths for options, Choice of electronic or mechanical attenuator, Superior level accuracy, Wideband FM and Phase Modulation, AM and Pulse Modulation, Step sweep (frequency, power and list), Built-in function generator.