The 2157-428-10-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 406.5 to 449.5 MHz, Bandwidth 43 MHz, Center Frequency 428 MHz, Insertion Loss 3 dB, Rejection 40 dB. Tags: DIP, Lumped Component Filter. More details for 2157-428-10-50 can be seen below.