The CGN-30-3.9G from Crane Aerospace & Electronics is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±1 dB, Frequency 2600 to 5200 MHz, Peak Power 10 kW, Average Power 300 W. Tags: Module with Connectors. More details for CGN-30-3.9G can be seen below.