Nizar,
The renormalization makes some assumptions that may not apply to your balun, in particular that S11=S22.
This is often close to true for things like ceramic filters, but is probably not close for your balun.
--John Gord
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On Sun, May 11, 2025 at 12:41 PM, Team-SIM SIM-Mode wrote:
Hi Dave
Thanks
I do not use any external artifact to take S21 Losses measurements with
equivalent 78.5 Ohm coax Z0 , i just use the DiSlord Z0 renormalisation option
on Display menu, this option take on consideration all computing's needed to
acte as a real 78.5 Ohm NanoVNA .
For measuring characteristic impedance of my Balun i use My owne purely
experimental methode , no computing nor modeling just measuring the resistor
value that focused the Smith diagram on one dote (resistor trimmer
termination) and read the renormalized impedance value that make it exactly on
the center of the the shart, it's easy methode, reliable and accurate enougth
without any computing errors and estimation, only direct experimental
measurement , see screenshoot illustration.
73's Nizar
