The OHP 65-4 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 65 MHz to 1.5 GHz, Insertion Loss 0.51 to 0.65 dB, Rejection 40 @ 41.9 MHz to 60 @ DC to 34, 1 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 65-4 can be seen below.