The EMA8J1250P20L30D from ECHO Microwave is a Band Pass Filter with Frequency 1.24 to 1.26 GHz, Insertion Loss 6 dB, Rejection 30 to 70 dB, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1250P20L30D can be seen below.