The 4242-20 from Narda-MITEQ is a Directional Coupler with Frequency 500 MHz to 2 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.5 dB, Directivity 22 dB. Tags: Module with Connectors. More details for 4242-20 can be seen below.