The 4MB/C-30/T6-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 26.935 to 33.065 MHz, Bandwidth 6.13 MHz (3dB), Center Frequency 30 MHz, Insertion Loss 1.35 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 4MB/C-30/T6-18 can be seen below.