The DEI9857-42.00MHz from Dynamic Engineers is a Band Pass Filter with Frequency 41.991 to 42.009 MHz, Bandwidth 18 kHz, Center Frequency 42 MHz, Insertion Loss 3.5 dB, Rejection 50 dB@±500 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9857-42.00MHz can be seen below.