The CSI-FLTR-17NF20-728-744&747-2300 from Westell Technologies is a RF High Pass Filter with Frequency 747 MHz to 2.3 GHz, Insertion Loss 3.0 dB, Power 20 W, Rejection 30 dB, VSWR 1.50:1. Tags: Module with Connectors. More details for CSI-FLTR-17NF20-728-744&747-2300 can be seen below.