The AM452S142 from Anatech Electronics is a Band Pass Filter with Frequency 449.6 to 454.4 MHz, Bandwidth 4.8 MHz, Center Frequency 452 MHz, Insertion Loss 2 to 2.8 dB, Upper Rejection 25 dB 464.8-1700 MHz. Tags: Surface Mount, RF SAW Filter. More details for AM452S142 can be seen below.