The QSDC-18000-31000-30-20-K from Qualwave is a Directional Coupler with Frequency 18000 to 31000 MHz, Coupling 20±1 dB, Directivity 12 dB, Average Power 30 W, Insertion Loss 1.4 dB. Tags: Module with Connectors. More details for QSDC-18000-31000-30-20-K can be seen below.