The WHK3-50-65-40-1250-20 from Wainwright Instruments is a RF High Pass Filter with Frequency 50 / 65 MHz to 1.25 GHz, Insertion Loss 0.4 to 0.45 dB, Power 20 W, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHK3-50-65-40-1250-20 can be seen below.