The DEI9829-4.80MHz from Dynamic Engineers is a Band Pass Filter with Frequency 3.25 to 6.35 MHz, Bandwidth -300 KHz, - 3100 KHz, Center Frequency 4.8 MHz, Insertion Loss 3.5 dB, Rejection 60 dB @ - 3900 KHz, 400 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9829-4.80MHz can be seen below.