The QSDC-1000-4000-50-20-S from Qualwave is a Directional Coupler with Frequency 1000 to 4000 MHz, Coupling 20±1 dB, Directivity 18 dB, Average Power 50 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-1000-4000-50-20-S can be seen below.