The CBP-1228C+ from Mini Circuits is a Band Pass Filter with Frequency 1217 to 1238 MHz, Center Frequency 1228 MHz, Insertion Loss 1.30 to 3 dB, Upper Rejection 20 to 29 dB, Lower Rejection 20 to 30 dB. Tags: Surface Mount, Ceramic Filter. More details for CBP-1228C+ can be seen below.