The QSDC-300-4000-50-30-S from Qualwave is a Directional Coupler with Frequency 300 to 4000 MHz, Coupling 30±1.5 dB, Directivity 12 dB, Average Power 50 W, Insertion Loss 1 dB. Tags: Module with Connectors. More details for QSDC-300-4000-50-30-S can be seen below.