The OHP 45-7 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 45 to 650 MHz, Insertion Loss 0.87 to 1.44 dB, Rejection 40 @ 37.6 MHz to 60 @ DC to 34.4 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 45-7 can be seen below.