The AM1230B1203 from Anatech Electronics is a Band Pass Filter with Frequency 1.17 to 1.29 GHz, Bandwidth 120 MHz, Center Frequency 1230 MHz, Insertion Loss 1 dB, Upper Rejection 15 dB 1530 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1230B1203 can be seen below.