I appreciate your sharing your results. They're in line with other anecdotal readings I've found over the years, as well as what an MS in Electrical Engineering friend once told me.

Reading up to learn more on this, here's [0], and doubtlessly there is classified material on non nuclear EMP devices, and it wouldn't surprise me if someone got itchy enough to test them in the field.

[0] https://www.inss.org.il/publication/electromagnetic/