The CSM-23-3G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 2000 to 4000 MHz, Coupling 23 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.8 dB, Directivity 22 dB. Tags: Module with Connectors. More details for CSM-23-3G SQ can be seen below.