K0KA made a quite polished presentation published as a Youtube video explaining how to measure balance performance of an antenna system and an ATU.
He did not define what he means by balance… but it will become apparent.
Midway through his video, he measures the ‘balance’ of a Palstar AT5K (though possibly modified) by connecting a symmetric load consisting of two 470Ω 2% resistors in series and connecting the junction to the ground terminal on the ATU.
Above, from KA0KA’s video, his test load. The oscilloscope probes can be seen.
The oscilloscope channel gains are carefully adjusted to be equal.
KA0KA shows two oscilloscope measurements.
Continue reading KA0KA’s Youtube test of ATU balance