[TowerTalk] Measuring Common Mode Choke with Anritsu VNA

Máximo EA1DDO_HK1H ea1ddo at hotmail.com
Sun Dec 31 18:56:57 EST 2017

Hi all,

All sorted.

This VNA is not showing Zcm on screen, but, it does show S21 LogMag and Phase at same time so you can see if LogMag value is targeting -30dB to -40dB, at Phase at low levels, then you  can guess the CM will be good.

To get the final figures, I can export the data in .s2p format, then do some maths in a Excel spreadsheet to get the CM data and even trace the results in a plot.

This is the spreadsheet I am using: http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Calculadora_Impedancia_Compleja.xlsx

So, thank you everyone, specially Jim, Steve, Gary and Norm.

Happy New Year !!

73, Maximo


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