Hi,
I have been trying to find the best prop for the rear lifter and then adjusting the notch filters with the online filter tool.
I cant find much advice on what is considered ‘good enough’.
Just watched @andyp1per ‘fun with notches’ and understand, if its under 10db it should be fine? Is is advised to chase it down lower if possible? What about the phase lag (lower graph). What lag is too much?
In hover my front 2 motors are doing 4500 rpm and the rear (with a different prop) is doing 3870 RPM and causing a different spike.
In the pic with estimated notch values, what is causing the large ‘trench’ at 73Hz when the notch is set to 64Hz?
Any advise appreciated for the best filter settings for this setup. Thanks.
First thing to check is that you have the motor pole count set correctly, that could give you the wrong value of RPM which will mean the notches are in the wrong place
The RPM reading is as expected and agrees very well with ecalc, however your comment prompted to be check. I have SERVO_BLH_POLES = 24 (the published value) but I also noticed there are others, KDE_NPOLE and SERVO_FTW_POLES both 14. Guess they dont affect the ESC telemetry?
I have been swapping props a lot during early testing and have been a bit lazy to check and adjust the notch values every time.
With the notch in the wrong place (75) everything was under 35db. If I shift the notch to 64 everything should be under 50db.
