The BBP-21.4 from Mini Circuits is a Band Pass Filter with Frequency 19.2 to 23.6 MHz, Bandwidth 4.4 MHz, Center Frequency 21.4 MHz, Insertion Loss 1.5 dB, Rejection 20 dB @ 15.5 MHz. Tags: Module with Connectors. More details for BBP-21.4 can be seen below.