The LC and crystal filter software was written as an aid for filter designers to simply plug in various filter parameters and hey presto! There is your finished design. Desgining crystal filters and find out crystal data by measuring it. This resource is listed under Technical Reference/Filters, at Homebrew Crystal Filter Design resource page via dxzone.com ham radio guide. Quartz Crystal Filter Design. Equivalent Circuit Determination of Quartz Crystals. Before we may design a crystal filter it is necessary to know the crystal's data.

  1. Crystal Filter Design Software
  2. Photo Filter software, free download
  3. Crystal Filter Design Software
  4. Crystal Filter Design Software Download

1) “Dishal” by DJ6EV

This software takes into account crystal parallel capacitance (Cp).
Crystal Cp is a reason for crystal ladder bandwidth narrower than designed in theory.
You need to provide crystal series resonance frequency and crystal inductance Lm or capacitance Cm. If you cannot measure Cp, you can assume value of 4pF.
”Dishal” includes set of useful tools for computing:
– crystal parameters using G3UUR method
– crystal parameters using 3dB method
– LC impedance match
– transforming series LC circuit into parallel one
– fine tubing crystal in a filter using series capacitance (moving resonance up)

‘Dishal’ computes Chebyshev and Butterworth designs, it also contains module for Cohn filters.

I used crystal with relatively low Lm and high Cm and filters computed with his software had slightly narrower bandwith than designer. Anyway I recommend ‘Dishal’ for most applications.

URL: http://fa-nwt.akadns.de/blogs/media/blogs/dj6ev/quarzfilter/deDishal2026.zip
Article with program description and good practical advices: http://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2009/QEX_Nov-Dec_09_Feature.pdf

2) “AADE Filter Design and Analysis”

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Software for designing many types of filters – not only crystal ladder.
It requires to specify many crystal parameters. But practical implementation of computed filter has parameters closely matching designed values.

It can design any type of crystal Lauder filter.
I used AADE to design my home made crystal filters for Elecraft K3 transceiver.
The help file is very good, you shouldn’t start work with AADE without Reading the tutorial

URL: http://www.aade.com/filter.htm

3) LCFD – “Ladder Crystal Filter Design” by UA1OJ

Crystal parameters are determined using G3UUR method
I haven’t tested filters designed with this software. Determining crystal parameters is working fine.
LCFD can design Chebyshev and Butterworth filters.

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Crystal Filter Design Software Download

Crystal Filter Design Software

URL: http://www.cqham.ru/lcfd.htm

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Photo Filter software, free download

Tags: crystal filters, crystal ladder, design

Crystal Filter Design Software

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Crystal Filter Design Software Download

There have been articles on how to design crystal filters in magazines for years. The difficulty always centered around measuring and selecting crystals and then designing the circuit. There are several programs which can help design a crystal filter but I generally use the free AADE Filter Design program at http://www.aade.com/filter.htm which designs several types of crystal ladder filters. All the programs I have seen require the crystals to have identical parameters. The measurement of the crystal parameters has been automated in the software for the AIM 4170 VNA (also in the AIM 4170 UHF and VNA 2180). Using a small fixture with socket pins, crystals can be measured with precision at a rate of 2 to 3 per minute. Other VNA's could have the ability to automatically measure crystals but I do not know of any which have the necessary software. The table below shows the file created by the AIM 4170. Notice that all the relevant crystal parameters are included. I generally match crystals first on Fs, Fp, and Q.
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