The QSDC-600-3900-50-10-S from Qualwave is a Directional Coupler with Frequency 600 to 3900 MHz, Coupling 10±1.5 dB, Directivity 12 dB, Average Power 50 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-600-3900-50-10-S can be seen below.