The ZDC8-30L20-500-1279 from COM-MW is a Directional Coupler with Frequency 20 to 500 MHz, Coupling 29 to 31 dB, Directivity 15 dB, Average Power 50 W, Insertion Loss 0.8 dB. Tags: Module with Connectors. More details for ZDC8-30L20-500-1279 can be seen below.