You are bidding on good used working HP 778D Coaxial Dual Direction Coupler. Key Features & Specifications Superior RF Performance Nominal Coupling and Variation: 20 ±1.0 dB Directivity: >36dB to 1 GHz Maximum SWR: 1.1 Insertion Loss: <0.60 dB Power ratings Power Rating Average, Peak: 50 W, 500 W Power Rating Average, Peak: 50 W, 500 W Description The Keysight 778D is an economical dual-directional coupler designed for swept measurements in the 100 MHz to 2 GHz range.