I found a cold solder joint on one of the HALL effect sensors. It had broken inside the shrink wrap and was intermittent. Re-soldered this and it's trying to sync once again.
I'm using only one magnet per engine. I've set the AUX channel so I can independently run up each engine.
Still the loop compensation seems off.
Once I get both engines running, they will both sync up past 6 or 7K RPM or so. They really lock on up there. But below that both engines oscillate slowly around the target. Each will over shoot and under shoot at around 1Hz or so, maybe a bit slower. Then engines vary up and down at least 500 RPM.
The engines are O.S. 61 FX's spinning EVOLUTION 3-blade props. which I think is about 10x6. I know this is a little less prop than the engine needs but I'm expecting to only need to run up to around 5/8 full throttle. I know at full throttle the engines will excede the 11.?K upper limit.
I've experimented with faster and slower by a couple of steps, but haven't found one to make the loop stable.
I am planning on setting the TWIN SYNC on two Saito 56 on my bench to see if there is any change.
Any thoughts would be appreciated. Erik