The CHPsc74-40F-40R from Narda-ATM is a Dual Directional Coupler with Coupling 40 dB, Frequency 2 to 4 GHz, Average Power 900 W, Insertion Loss 0.15 to 0.2 dB, Directivity 23 dB. Tags: Module with Connectors. More details for CHPsc74-40F-40R can be seen below.