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this post was submitted on 30 Nov 2023
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Could it be the motor?
The second harmonic from 60hz is 120, which is close to where your hearing it? For what its worth, i get a peak at 100hz, which for the australian grid would make sense?
I used this app: https://play.google.com/store/apps/details?id=org.intoorbit.spectrum
I dont see a 50hz peak, but 100hz was clearly represented.
I checked against a tone generator, and realized that the lower frequency was actually 120, not 60, so I'd guess you're probably hearing that. That puts the higher frequency at 212-214, which I also checked and that range matches what I'm hearing (for 100hz, it should be at around 177-180).