I used AADE to design my home made crystal filters for Elecraft K3 transceiver. It can design any type of crystal Lauder filter. But practical implementation of computed filter has parameters closely matching designed values. It requires to specify many crystal parameters. Software for designing many types of filters – not only crystal ladder. Anyway I recommend ‘Dishal’ for most applications.Īrticle with program description and good practical advices: I used crystal with relatively low Lm and high Cm and filters computed with his software had slightly narrower bandwith than designer. ‘Dishal’ computes Chebyshev and Butterworth designs, it also contains module for Cohn filters. – fine tubing crystal in a filter using series capacitance (moving resonance up) – transforming series LC circuit into parallel one ”Dishal” includes set of useful tools for computing: ![]() If you cannot measure Cp, you can assume value of 4pF. ![]() You need to provide crystal series resonance frequency and crystal inductance Lm or capacitance Cm. This software takes into account crystal parallel capacitance (Cp).Ĭrystal Cp is a reason for crystal ladder bandwidth narrower than designed in theory. Software for designing crystal ladder filters:
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