The DC0400T3000SF from JQL Electronics is a Directional Coupler with Frequency 400 MHz to 3 GHz, Coupling 10 dB, Coupling Variation ±1 dB, Average Power 0.01 to 0.03 W, Insertion Loss 1.2 dB. Tags: Module with Connectors. More details for DC0400T3000SF can be seen below.