The AM1542B1438 from Anatech Electronics is a Band Pass Filter with Frequency 1525.5 to 1559.5 MHz, Bandwidth 34 MHz, Center Frequency 1542 MHz, Insertion Loss 2 dB, Rejection 30 to 50 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1542B1438 can be seen below.