The QSDC-4000-6000-K4-40-N from Qualwave is a Directional Coupler with Frequency 4000 to 6000 MHz, Coupling 40±1.5 dB, Directivity 10 dB, Average Power 400 W, Insertion Loss 0.6 dB. Tags: Module with Connectors. More details for QSDC-4000-6000-K4-40-N can be seen below.