The CDM-20-1.975G SQ from Crane Aerospace & Electronics is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±1 dB, Frequency 1650 to 2300 MHz, Average Power 5 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for CDM-20-1.975G SQ can be seen below.