The 6MB/C-540/H45-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 513.9 to 566.1 MHz, Bandwidth 52.2 MHz (0.5dB), Center Frequency 540 MHz, Insertion Loss 1.73 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 6MB/C-540/H45-18 can be seen below.