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Re:Mystery Frequency Disrupted Car Fobs in an Ohio City, and... by davidgay on Sunday May 05, 2019 @12:27PM (#19833556)
A square wave IS the base frequency plus ALL[1] the odd harmonics (https://en.wikipedia.org/wiki/Square_wave#Fourier_analysis explains it better than I could).

[1]: Yes, so in reality you neither get an infinite set of harmonics, nor a perfect square wave.

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