The OHP 45-3 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 45 to 650 MHz, Insertion Loss 0.34 to 0.41 dB, Rejection 40 @ 23.4 MHz to 60 @ DC to 17.6 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 45-3 can be seen below.