The QSDC-1000-4000-50 from Qualwave is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 10 to 20 dB, Directivity 20 dB, Average Power 50 W, Insertion Loss 0.8 dB. Tags: Module with Connectors. More details for QSDC-1000-4000-50 can be seen below.