The DEI9117-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.388 to 21.412 MHz, Bandwidth 24 kHz, Center Frequency 21.4 MHz, Insertion Loss 3.5 dB, Rejection 70 dB@±23 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9117-21.40MHz can be seen below.