COMPLEX RADIO CONTROL SYSTEM
5.6. Sensor calibration
5.5.4 Example of band filter adjustment
Sensor calibration is important for the
correc t and accurate function of
stabilisation. The receiver calibrates the
offsets of an internal gyroscope
automatically, always after the receiver
– it's used to filter out specific frequencies caused by engine
vibrations. You can additionally activate this filter if the vibrations
caused by the engine are relatively high. Check the vibration level
regularly via "Vibration Analysis" receiver menu with the engine
running. The engine should run at such revolutions as are most
common in flight.
5.5.3 Band Filter (Notch Filter)
- the illustration shows vibrations of a motor that rotates at 200Hz,
12000 rpm. We will choose the average filter frequency of 200Hz, as
there is a peak in this area. We set the filter bandwidth somewhere
between 50-150Hz. The narrower the filter bandwidth, the more
precisely the filter will be able to reduce the signals with the
specified frequency. However, as the motor speed and thus the
vibration frequency changes during flight, it is preferable to choose
wider bandwidth, approx about 100Hz.
is switched on. Approximately for 2
seconds after turning on, keep the model at stationary position. It's
not required to keep the model horizontally, but the tilt angle
should not exceed 30°. Once the gyroscope is calibrated, the
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