The DEI9850-20.70MHz from Dynamic Engineers is a Band Pass Filter with Frequency 20.6985 to 20.7015 MHz, Bandwidth 3 kHz, Center Frequency 20.7 MHz, Insertion Loss 4 dB, Rejection 45 dB@±8.75 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9850-20.70MHz can be seen below.