The QSDC-6000-18000-K4-40-NS from Qualwave is a Directional Coupler with Frequency 6000 to 18000 MHz, Coupling 40±1 dB, Directivity 10 dB, Average Power 400 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-6000-18000-K4-40-NS can be seen below.