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CameronDev ,

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: play.google.com/store/apps/details?id=org.intoorb…

I dont see a 50hz peak, but 100hz was clearly represented.

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