The DEI9591-5.20MHz from Dynamic Engineers is a Band Pass Filter with Frequency 3.5 to 6.9 MHz, Bandwidth 300 KHz, 3400 KHz, Center Frequency 5.2 MHz, Insertion Loss 5 dB, Rejection 60 dB @ - 1000 KHz, + 4570 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9591-5.20MHz can be seen below.