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PTBpro Q&A # 11 (Sun. Oct 6, 2024) (Patreon)

Published:
2024-10-16 14:22:08
Imported:
2026-06
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PTBpro Q&A #11 | OCT6, 2024

Comments

Mateusz Miskowiak

I remember from one of your previous videos that an ideal signal-to-noise ratio should be around 30 dB, and that's the target I'm aiming for in all my builds. However, I'm a bit unsure about how to calculate it. Should I measure the signal strength within the frequency range of the stick movements (say, 0-10 Hz) and then check if the noise in the 10-100 Hz range is at least 30 dB lower than the signal strength? Is that correct?

The PIDtoolbox Guy
>>154263040

Ideally you want to see near -40dB during the quiet range from roughly 20hz to 100hz or so or wherever the 1st motor band starts. This is different for different drones. The most important noise index is dterm however because it’s the main contributor to noise in the commanded motor signals. There you ideally want noise below -10dB possibly lower. But you do not want to try to achieve this with filters. This quiet range is dependent upon electronics, caps and build. You can’t really filter easily over that quiet range. It’s either good or not and if not you have to try to understand why and what can be done about it. If it’s really bad it’s likely only a new FC will fix it.