The WHK10-35-40-40-1000-20 from Wainwright Instruments is a RF High Pass Filter with Frequency 35 / 40 MHz to 1 GHz, Insertion Loss 2 to 4.8 dB, Power 20 W, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHK10-35-40-40-1000-20 can be seen below.