The DEI9842-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.3935 to 21.4065 MHz, Bandwidth 13 kHz, Center Frequency 21.4 MHz, Insertion Loss 2 dB, Rejection 45 dB@±6.7 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9842-21.40MHz can be seen below.