The QDDC-500-26500-30-10-S from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±1.5 dB, Frequency 500 to 26500 MHz, Average Power 30 W, Insertion Loss 4 dB. Tags: Module with Connectors. More details for QDDC-500-26500-30-10-S can be seen below.