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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
Simplest 455 KHz Oscillator uses only three parts negative resistance ceramic filter oscillator ceramic resonator oscillator
455Khz IF Filter Part 2 – Rob's Blog
Simplest 455 KHz Oscillator uses only three parts negative resistance ceramic filter oscillator ceramic resonator oscillator