The CDM-30-.435G SQ from Crane Aerospace & Electronics is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±1 dB, Frequency 400 to 470 MHz, Average Power 5 W (CW), Insertion Loss 0.25 dB. Tags: Module with Connectors. More details for CDM-30-.435G SQ can be seen below.