The QSDC-300-8000-20-20-S from Qualwave is a Directional Coupler with Frequency 300 to 8000 MHz, Coupling 20±1 dB, Directivity 18 dB, Average Power 20 W, Insertion Loss 1.3 dB. Tags: Module with Connectors. More details for QSDC-300-8000-20-20-S can be seen below.