11/8/2023 0 Comments Free rf filter design software![]() ![]() Notice that all the relevant crystal parameters are included. ![]() The table below shows the file created by the AIM 4170. Other VNA's could have the ability to automatically measure crystals but I do not know of any which have the necessary software. Using a small fixture with socket pins, crystals can be measured with precision at a rate of 2 to 3 per minute. 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). All the programs I have seen require the crystals to have identical parameters. There are several programs which can help design a crystal filter but I generally use the free AADE Filter Design program at which designs several types of crystal ladder filters. The difficulty always centered around measuring and selecting crystals and then designing the circuit. ![]() There have been articles on how to design crystal filters in magazines for years. ![]()
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