The D3-20003 / 20004 from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1 to 100 MHz, Coupling 20.25 dB, Coupling Variation ±0.1 dB, Directivity 25 dB, Average Power 3 W. Tags: Module with Connectors. More details for D3-20003 / 20004 can be seen below.