The HP / Agilent 89411A is a used Network Analyzer Downconverter. It works with the Agilent HP 89410A to provide narrowband vector signal analysis at RF and microwave frequencies. Converts a 21.4 MHz IF output from an external receiver to the input frequency range of the Agilent HP 89410A. This downconverter is also compatible with the Agilent HP 89440A and Agilent HP 89441A. The Agilent HP 89411A is designed for use with various Agilent microwave spectrum analyzers and other devices with compatible 21.4 MHz IF outputs. Frequency coverage is thus available over the complete frequency range of the microwave receiver or analyzer.