On Wed, Oct 20, 2021 at 09:05 AM, Jim Lux wrote:
It occurs to me that one could write a software application, either on a host
computer, or as alternate firmware for the NanoVNA that would work as a
"identify the mystery toroid".
Run a couple turns through the core, measure the S11 over a broad frequency
range to get a rough idea, then run a narrower span, and you should be able to
automatically compare to a collection of published materials and core
dimensions. (FairRite, for example, publishes .xls files for all their
materials)
One method is to find the frequency where R and X cross. That corresponds to where the complex permeability values ¦Ì¡ä and ¦Ì¡å cross and is unique to each ferrite Mix.
Roger
Roger
Roger Need