There are many types of 455KHz ceramics filters out there, what is the different between them? the 455KHz usually comes with suffix A/B/C/D/E, indicating the bandwidth of the filter. what is the filter response actually looks like? In this test we picked 3 ceramics filter, They are -A -D and -E.
The A type filter having an impedance of 600 ohm for both in-out, D and E type having an impedance of 1500 ohm. The filters are loaded with resistor and output RMS voltage are measured using oscilloscope.
The responses are normalized and the result turns out like this. So now I get some concept of what the shape of their frequency response looks like.
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