The DEI9789-8.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 6.7 to 10.1 MHz, Bandwidth 350 KHz, 3400 KHz, Center Frequency 8.4 MHz, Insertion Loss 4.5 dB, Rejection 60 dB @ - 1000 KHz, 5000 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9789-8.40MHz can be seen below.