The 6BJ20-12900/T400-O/O from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 12669 to 13131 MHz, Bandwidth 462 MHz (3dB), Center Frequency 12900 MHz, Upper Rejection 40 dB, Lower Rejection 40 dB. Tags: Cavity Filter. More details for 6BJ20-12900/T400-O/O can be seen below.