The AE125H9912 from Anatech Electronics is a RF High Pass Filter with Frequency 125 to 512 MHz, Insertion Loss 1 dB, Power 65 W, Rejection 70 dB@1 MHz to 75 MHz (Rejection2 46 dB@90 MHz), Return Loss 15 dB. Tags: Module with Connectors, Lumped Component Filter. More details for AE125H9912 can be seen below.