The MDC-20 from Microwave Devices Inc. is a Directional Coupler with Frequency 860 to 904 MHz, Coupling 20 dB, Coupling Variation ±0.5 dB, Amplitude Flatness ±0.5 dB, Directivity 20 to 25 dB. Tags: Module with Connectors. More details for MDC-20 can be seen below.