The MDC-40 from Microwave Devices Inc. is a Directional Coupler with Frequency 860 to 904 MHz, Coupling 40 dB, Coupling Variation ±1.0 dB, Amplitude Flatness ±0.5 dB, Directivity 20 to 25 dB. Tags: Module with Connectors. More details for MDC-40 can be seen below.