The WHKE4-600-1000-60-4000-1 from Wainwright Instruments is a RF High Pass Filter with Frequency 600 MHz / 1 GHz to 4 GHz, Insertion Loss 0.7 to 1 dB, Power 1 W, Rejection 60 dB, VSWR 1.67:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHKE4-600-1000-60-4000-1 can be seen below.