The QSDC-4000-8000-50-10-S from Qualwave is a Directional Coupler with Frequency 4000 to 8000 MHz, Coupling 10±1 dB, Directivity 16 dB, Average Power 50 W, Insertion Loss 1 dB. Tags: Module with Connectors. More details for QSDC-4000-8000-50-10-S can be seen below.