Characterizing Common Mode Chokes using the NanoVNA

This is a video showing the characterization of the impedance across frequencies from 3.0 to 30.0 MHz using a nanoVNA (H4). The freely available nanoVNASaver software is also used to graph the impedance profiles. The technique used and the threshold of -25dB for good common mode current rejection comes from Mark Smith's (N6MTS) presentation on QSO Today 2021Virtual Ham Expo. That presentation can be seen at this URL:    • Measuring Common Mode Current Chokes with ...   00:00 Intro 01:16 nanoVNA Saver 02:04 testing setup 05:43 7 loop choke 07:15 17 loop choke 08:48 wrap up