The CRM-20-500 from Crane Aerospace & Electronics is a Directional Coupler with Frequency 10 to 1000 MHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.5 to ±1 dB, Directivity 15 to 20 dB. Tags: Module with Connectors. More details for CRM-20-500 can be seen below.