John Larkin Inscribed thus:
Did you use one of those online calculators? A lot of them are plain
wrong. I also suspect a lot of people are copying one anothers'
javascript, because I see the same wrong calculators in multiple
places.

A lot of microstrip-type calculators are wrong. Try a really wide
trace; the bad ones will report a negative impedance.

We could start a list of bad online calculators.

John

Now that could be a good idea ! But it shouldn't prevent checking and
confirming a result. :-)

--
Best Regards:
Baron.