The CSBP-D1228 from Mini Circuits is a Band Pass Filter with Frequency 1.2 to 1.25 GHz, Bandwidth 50 MHz, Center Frequency 1228 MHz, Insertion Loss 0.9 to 2 dB, Rejection 20 dB @ DC-1020 and 1425-2500 MHz. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CSBP-D1228 can be seen below.