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The Keysight (formerly Agilent) E4421B Analog RF Signal Generator offers excellent in-channel performance with superior quality, reliability and worldwide support -- at an affordable price. The first in a new generation of signal generators, it provides excellent frequency and level control, and wide analog modulation capabilities. It is ideally suited to meet the demanding requirements of today's receiver test, component test and local oscillator applications. Features Flexible architecture, 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