The DEI9838-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.375 to 21.425 MHz, Bandwidth 50 kHz, Center Frequency 21.4 MHz, Insertion Loss 8 dB, Rejection 60 dB@±150 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9838-21.40MHz can be seen below.