The CSM-10-12.1G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 11450 to 12750 MHz, Coupling 10 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.75 dB, Directivity 19 dB. Tags: Module with Connectors. More details for CSM-10-12.1G SQ can be seen below.