The CSM-30-19.85G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 17700 to 22000 MHz, Coupling 30 dB, Coupling Variation ±1.5 dB, Frequency Sensitivity ±0.75 dB, Directivity 14 dB. Tags: Module with Connectors. More details for CSM-30-19.85G SQ can be seen below.