The CSM-30-1.64G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1626 to 1660 MHz, Coupling 30 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.2 dB, Directivity 20 dB. Tags: Module with Connectors. More details for CSM-30-1.64G SQ can be seen below.