The 3-4174 Series from ARRA Inc. is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 6, 10, 20 ±1.0 dB, Coupling Variation 1.0 dB, Directivity 23 dB, Power 50 W. Tags: Module with Connectors. More details for 3-4174 Series can be seen below.