The OHP 35-4 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 35 MHz to 1 GHz, Insertion Loss 0.56 to 0.87 dB, Rejection 40 @ 22.6 MHz to 60 @ DC to 18, 4 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 35-4 can be seen below.