The QSDC-300-800-50-30-S from Qualwave is a Directional Coupler with Frequency 300 to 800 MHz, Coupling 30±1 dB, Directivity 10 dB, Average Power 50 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for QSDC-300-800-50-30-S can be seen below.