The HRT-DQ(1000/4000)-20N from Chengdu Filter Technology Co.,Ltd is a Dual Directional Coupler with Coupling 19 to 21 dB, Frequency 1 to 4 GHz, Peak Power 0.5 kW, Average Power 50 W, Insertion Loss 0.4 to 0.6 dB. Tags: Module with Connectors. More details for HRT-DQ(1000/4000)-20N can be seen below.