The DEI9745-5.25MHz from Dynamic Engineers is a Band Pass Filter with Frequency 3.55 to 6.95 MHz, Bandwidth 350 KHz, 3400 KHz, Center Frequency 5.25 MHz, Insertion Loss 4.5 dB, Rejection 60 dB @ - 1000 KHz, 5000 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9745-5.25MHz can be seen below.