The advice from the expert.
The approximation of INS_HNTCH_REF if you are using a throttle-based harmonic notch. It can be fine-tuned with the filter review tool if necessary.
This may be helpful if you experience multiple noise/vibration peaks.
I guess he is using latest version that’s why i wrote it.
@Goran_F450 do not assume that, ask it directly. @prsh8ya are you using ArduCopter 4.6.0-beta1 or newer?
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I am using the latest stable version.
That one has no multi source throttle notch filter