The Keysight 8657B offers excellent performance at an economical price. The low residual FM and excellent phase noise performance of these signal generators make them ideal for many in-channel and even out-of-channel receiver tests. The Keysight 8657B is a versatile signal generator offering a variety of features, such as extended frequency coverage up to 2060 MHz, pulse modulation, simultaneous and mixed modulation combinations of AM and FM, as well as a carrier phase adjust capability that allows you to characterize phase-sensitive devices. In addition, the Keysight 8657B offers a wide output range, +13 to -143.5 dBm with superior level accuracy of ±1.0 dB. Built to stringent quality standards, the Keysight 8657B will promote consistent, repeatable measurements every time.