In manual mode (stabilize when manual inputs are used) I get flutter on all channels, as in all servos move when I touch the stick.
It appears that in automatic modes (RTL) the flutter appears again as my video (servos pointing the camera) jerks in flight.
They all behave properly otherwise.
They only "flutter" when I barely touch the sticks but all of them do it, as in the rudder twitches when I move ailerons.
I have modified that radio with a 1W 2.4Ghz amplifier for long range. In flight it works fine, save for this flutter (which is not a big enough influence to see the effect of while in flight...yet?)
Board is APM 2.6 from 3DR.
Through extensive testing:
- If I use only a battery, the Receiver and servos directly (no APM involved, traditional RC setup) the problem does not exist. Therefore I conclude that it is not a Tx setting or a Rx fault of some kind.
- The problem persists even if the Rx is in High Speed mode or Normal mode
- No amount of ferrite ring wrapping does a thing to it.
- No possibility of induced voltages/signals due to wire straightness/proximity
- Removing servo connections one by one does not change anything
- If I look at the Calibrate Radio menu in the MP, I can SEE the PPM values jumping by about 35 points on all channels when you even just breathe on the sticks of the Tx.
- Analogue servos are worse, multiple digital servo brands used, problem persists
- There are no ground issues that I can detect either on input or output sides of the APM 2.6
- All voltage checks on input/output sides are normal so far as I can tell
- Latest firmware update to 2.78b does not solve the problem
- If I "disable" a channel via the variables list within the MP, the servo does indeed stop working while the rest flutter.
The closest thing I could find is that with Futaba radios (newer ones?) I might need to flash the Atmega32U2 chip. Which was noted in this thread. That procedure is something I don't want to do until I get more input on this problem. If it is not that, then I REALLY need help.