The QSDC-18000-50000-20 from Qualwave is a Directional Coupler with Frequency 18000 to 50000 MHz, Coupling 10±0.7 to 20±0.8 dB, Directivity 8 to 9 dB, Average Power 20 W, Insertion Loss 1.5 to 1.6 dB. Tags: Module with Connectors. More details for QSDC-18000-50000-20 can be seen below.