The QSDC-500-18500-20-10-S from Qualwave is a Directional Coupler with Frequency 500 to 18500 MHz, Coupling 10±1 dB, Directivity 10 dB, Average Power 20 W, Insertion Loss 1.6 dB. Tags: Module with Connectors. More details for QSDC-500-18500-20-10-S can be seen below.