The OHP 325-6 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 325 MHz to 3 GHz, Insertion Loss 0.51 to 0.7 dB, Rejection 40 @ 257 MHz to 60 @ DC to 229 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 325-6 can be seen below.