The AM1542B1548 from Anatech Electronics is a Band Pass Filter with Frequency 1525 to 1559 MHz, Bandwidth 34 MHz, Center Frequency 1542 MHz, Insertion Loss 1.3 to 2 dB, Rejection 8 to 40 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1542B1548 can be seen below.