The QSDC-1000-4000-30 from Qualwave is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 10 to 30 dB, Directivity 20 dB, Average Power 30 W, Insertion Loss 1 dB. Tags: Module with Connectors. More details for QSDC-1000-4000-30 can be seen below.