The HJM-0.3K from Crane Aerospace & Electronics is a 180 Degree Hybrid Coupler with Frequency 200 to 400 MHz, Average Power 200 W, Coupling -3 dB, Amplitude Balance 0.3 dB, Phase Balance ±1 Degrees. Tags: Module with Connectors. More details for HJM-0.3K can be seen below.