The QSDC-400-4200-K2-40-N from Qualwave is a Directional Coupler with Frequency 400 to 4200 MHz, Coupling 40±1.8 dB, Directivity 12 dB, Average Power 200 W, Insertion Loss 0.35 dB. Tags: Module with Connectors. More details for QSDC-400-4200-K2-40-N can be seen below.