Re: Asymmetric Stripline / Microstrip online calculators for impedance and velocity

On 20/05/2025 16:48, john larkin wrote:

On Tue, 20 May 2025 14:53:37 +0100, Mike Perkins <spam@spam.invalid>
wrote:
 

>
I can find numerous calculators that provide impedance for the above
structures, but are there any that give propagation velocity too?

 The Saturn PCB Toolkit does.
 Great program, and free.

I downloaded a copy and it does have all the feature I seem to need.
However for "Stripline Asym", in the Formula Selection I get a choice of Default, IPC-2141 and Wadell. If I choose Default I get very different results and a line appears "Narrow calculation mode".
What does this mean?
And some very different numbers compared to:
   https://jlcpcb.com/pcb-impedance-calculator
--
Mike Perkins
Video Solutions Ltd
www.videosolutions.ltd.uk