The OHP 100-4 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 100 MHz to 2 GHz, Insertion Loss 0.49 to 0.56 dB, Rejection 40 @ 64.5 MHz to 60 @ DC to 52, 5 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 100-4 can be seen below.