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As you can see here to calculators I found show huge difference or didn't I set it up correctly? I didn't found hints on possible validity limits. Can someone say if one of those given out results is correct? I mean a mismatch of 18 ohm is a no go... Both freeware, is there a commercial software with higher quality?

Edit: Added image with changed material, no significant change, as to my knowledge only the dielectric constant is important, which was set to same value in first 2 pictures. Am I missing something? enter image description here

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They are set to different materials, which probably affects the results. –  Brian Drummond Feb 20 '13 at 22:47
    
As Brian said, make sure all the relevant specs are matched. Otherwise I can tell you that I've used TXLINE and it's very good. I've simulated and created physical boards and the numbers it gives are good. –  Gustavo Litovsky Feb 20 '13 at 23:34
    
@BrianDrummond I changed the material, but in TXLine it seems it is only important what you edit in the dielectric constant field, the "material" tab just saves this numbers for a few materials –  James Last Feb 20 '13 at 23:48
    
@BrianDrummond I dont know why ur comment gets more upvotes, I changed the material and it didnt improve, what am I missing? Can you explain, thanks! –  James Last Feb 21 '13 at 12:50
    
Keep in mind this : electronics.stackexchange.com/questions/48867/… –  Blup1980 Feb 21 '13 at 15:04
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