The CSC-30-.405G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 400 to 410 MHz, Coupling 30 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.15 dB, Directivity 20 dB. Tags: Module with Connectors. More details for CSC-30-.405G SQ can be seen below.