The 3-9174 Series from ARRA Inc. is a Directional Coupler with Frequency 1.0 to 18.0 GHz, Coupling 10, 16, 20 ±1.0 dB, Coupling Variation 1.0 dB, Power 50 W, Average Power 50 W. Tags: Module with Connectors. More details for 3-9174 Series can be seen below.