The AE1250B9971 from Anatech Electronics is a Band Pass Filter with Frequency 1 to 1.5 GHz, Bandwidth 500 MHz, Center Frequency 1250 MHz, Insertion Loss 2 dB, Upper Rejection 50 dB 1.76 to 6 GHz. Tags: Surface Mount, Lumped Component Filter. More details for AE1250B9971 can be seen below.