The DEI9858-43.50MHz from Dynamic Engineers is a Band Pass Filter with Frequency 43.488 to 43.512 MHz, Bandwidth 24 kHz, Center Frequency 43.5 MHz, Insertion Loss 3.5 dB, Rejection 40 dB@±27 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9858-43.50MHz can be seen below.