JBS
Heliman
Location: UK & USA
| Servo JittersI hope by now you have your jitters sorted out.
I had the exact same problem with my E-Chinook setup when I got to about 92% throttle.
In my case the problem was caused by resonance between the gyro unit and the main frame. It is easy to test this- just unplug the gyro lead from the mixer unit. If the jitters stop when you run up, the gyro mounting is the cause. Even without the gyro plugged in, the servos will respond to your stick inputs. If the jitter re-appear when you plug the gyro back in, it confirms that the gyro mounting is the problem.
In my case, I simply increased the thickness of the foam tape holding the gyro to the frame by a couple of extra layers. This seemed to isolate the gyro from the frame vibration to a far better extent, and the jitters have gone.
Of course if you make the foam too thick, you could run into another resonance area at a different frequency. I think its simply a question of trial and error- I dont think there is any hard and fast way to arive at the corrct foam thickness.
I am using the Specktrum 6900 RX and module into my Futaba TX. The mixer unit is set up exactly per the manual for the Futaba TX, and it works very well. I have not needed to adjust any settings. I have the Spektrum data logger plugged in and I have not lost any significant frame numbers, nor experienced any glitches.
I am also using a LIPO RX battery setup to ensure that the on-board voltage never drops below 3.5volts, even under full servo load, because below this voltage the Spectrum RX resets itself and locks out for up to 3 seconds. There is a safety notice about this problem on the horizon hobby website. |
