The QJN-3-.300G from Crane Aerospace & Electronics is a 90 Degree Hybrid Coupler with Frequency 100 to 500 MHz, Average Power 200 to 500 W, Peak Power 10 kW, Insertion Loss 0.3 to 0.5 dB, Isolation 18 dB. Tags: Module with Connectors. More details for QJN-3-.300G can be seen below.