The CHPFL-0500 from Crystek Corporation is a RF High Pass Filter with Frequency DC to 500 MHz, Insertion Loss 0.81 to 112.15 dB, Power 4 W, Return Loss 0.01 to 10.62 dB, Operating_Temperature -40 to 85 Degree C. Tags: Connectorized, Butterworth. More details for CHPFL-0500 can be seen below.