The OHP 600-6 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 600 MHz to 3 GHz, Insertion Loss 0.55 to 0.79 dB, Rejection 40 @ 474 MHz to 60 @ DC to 423 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 600-6 can be seen below.