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Murata's CFU, CFW, SFP 450kHz to 455kHz Ceramic Filters | TTI, Inc.
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rf - Is it possible to combine two CFU455IT +/-2kHz (4kHz) ceramic filters to get a +/-1.25kHz bandwith (2.5kHz) filter? - Electrical Engineering Stack Exchange
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Simplest 455 KHz Oscillator uses only three parts negative resistance ceramic filter oscillator ceramic resonator oscillator
How to make an IF filter on 455 KHz yourself & test the bandwidth with a wobbulator - YouTube