The CDM-30M-3G from Crane Aerospace & Electronics is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±1.25 dB, Frequency 2000 to 4000 MHz, Average Power 50 W (CW), Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for CDM-30M-3G can be seen below.