The QDDC-400-3900-K15-13-NS from Qualwave is a Dual Directional Coupler with Coupling 13 dB, Coupling Variation ±1.5 dB, Frequency 400 to 3900 MHz, Average Power 150 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-400-3900-K15-13-NS can be seen below.