The CYK-16R-21G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 2000 to 40000 MHz, Coupling 16 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±1 dB, Directivity 15 to 18 dB. Tags: Module with Connectors. More details for CYK-16R-21G can be seen below.