The QSDC-3400-4200-50-30-S from Qualwave is a Directional Coupler with Frequency 3400 to 4200 MHz, Coupling 30±1 dB, Directivity 15 dB, Average Power 50 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-3400-4200-50-30-S can be seen below.