The QSDC-4000-30000-30-20-K from Qualwave is a Directional Coupler with Frequency 4000 to 30000 MHz, Coupling 20±1 dB, Directivity 12 dB, Average Power 30 W, Insertion Loss 1.5 dB. Tags: Module with Connectors. More details for QSDC-4000-30000-30-20-K can be seen below.