The QSDC-400-3000-K3-50-S from Qualwave is a Directional Coupler with Frequency 400 to 3000 MHz, Coupling 50±2.5 dB, Directivity 20 dB, Average Power 300 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-400-3000-K3-50-S can be seen below.