The 4MB/C-225/U50-S4G from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 193.5 to 256.5 MHz, Bandwidth 63 MHz (1dB), Center Frequency 225 MHz, Insertion Loss 1 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 4MB/C-225/U50-S4G can be seen below.