The PCD-800-4200-R3N40 from Preferred Power Products (P3) is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1.5 dB, Frequency 800 MHz to 4.2 GHz, Average Power 300 W, Insertion Loss 0.25 dB. Tags: Module with Connectors. More details for PCD-800-4200-R3N40 can be seen below.