The 5MB/C-27.5/H1-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 26.85 to 28.15 MHz, Bandwidth 1.3 MHz (0.5dB), Center Frequency 27.5 MHz, Insertion Loss 3.6 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 5MB/C-27.5/H1-18 can be seen below.