The QSDC-400-3900-K15-15-NS from Qualwave is a Directional Coupler with Frequency 400 to 3900 MHz, Coupling 15±1.5 dB, Directivity 16 dB, Average Power 150 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-400-3900-K15-15-NS can be seen below.