The DEI9928-21.45MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.435 to 21.465 MHz, Bandwidth 30 kHz, Center Frequency 21.45 MHz, Insertion Loss 3 dB, Rejection 65 dB@±35 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9928-21.45MHz can be seen below.