The QSDC-4000-50000-20-10-2 from Qualwave is a Directional Coupler with Frequency 4000 to 50000 MHz, Coupling 10±2.0 dB, Frequency Sensitivity ±1.8 dB, Directivity 10 dB, Average Power 20 W. Tags: Module with Connectors. More details for QSDC-4000-50000-20-10-2 can be seen below.