Keysight N4985A 100 kHz-50 GHz Microwave System Amplifier N4985A-S50Condition: Used Fully tested and working, like new. Pictures of actual product. No additional accessories. N4985A System Amplifiers N4985A S50 operates from 100 kHz to 50 GHz Achieve excellent power and gain with these self contained, high performance broadband amplifiers The Keysight Technologies N4985A series system amplifiers are high performance broadband amplifiers with excellent power and gain from 100 kHz to 50 GHz. The amplifiers are self