The DEI9839-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.392 to 21.408 MHz, Bandwidth 16 kHz, Center Frequency 21.4 MHz, Insertion Loss 8 dB, Rejection 60 dB@±20 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9839-21.40MHz can be seen below.