Re: 50 ohm on FR4

On Sun, 2 Feb 2025 12:00:24 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Cursitor Doom" <cd@notformail.com> wrote in message news:pssupj9omf6d3ao3jpilfjmhkommdf0m6e@4ax.com...

Grok reckons to make a 50 ohm tx line on FR4 I would need  a Trace
Width of approximately 2.73 mm and a Trace Spacing of at least 2.73
mm. Does that sound about right?

>
It doesn't seem to match anything I can get from the site below with 2oz copper and er=4
Does Grok know the difference between stripline and microstrip?
>
https://www.elektroda.com/calculators/pcb-impedance-calculator-microstrip
>

The Saturn pcb toolkit seems to be very good. We use that and the
traces are right in real life.

It does other stuff, like calculating trace capacitances and
inductances and via properties, lots of useful calcs.