The AM1575S377 from Anatech Electronics is a Band Pass Filter with Frequency 1.57 to 1.58 GHz, Bandwidth 2 MHz, Center Frequency 1575.42 MHz, Insertion Loss 1.7 to 2.2 dB, Upper Rejection 41 dB 1625-1640 MHz. Tags: Surface Mount, RF SAW Filter. More details for AM1575S377 can be seen below.