The QSDC-18000-40000-30 from Qualwave is a Directional Coupler with Frequency 18000 to 40000 MHz, Coupling 10±1 to 30±1.2 dB, Directivity 10 to 12 dB, Average Power 30 W, Insertion Loss 1 to 1.6 dB. Tags: Module with Connectors. More details for QSDC-18000-40000-30 can be seen below.