The AM1583B1512 from Anatech Electronics is a Band Pass Filter with Frequency 1557 to 1610 MHz, Bandwidth Fo ± 26.5 MHz, Center Frequency 1583.5 MHz, Insertion Loss 2.2 dB, Rejection 25 to 40 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1583B1512 can be seen below.