The RFDDC10M22M50 from RF-Lambda is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±2 dB, Frequency 15.8 to 21.8 MHz, Average Power 20 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for RFDDC10M22M50 can be seen below.