ESC Calibration

Hi All

I have been struggling with this for a few months on and off but I have been at it full on this past week and I have got nowhere!! 

I go through all the usual steps and after the long monotone note, I press the arm button and noises are made, wait for them to stop then move the throttle down to low and it is recognised,THEN the strange bit, about 10% of the time 1 of the motors will correctly calibrate. I have had 2 motors correctly calibrated at once as my personal best and all of the motors do spin they just do it in pairs! I would really appreciate any help any of you can suggest.

Many Thanks

James 

This is my set up as it would be useful for anyone who could help:

Tunrigy 9x + the encoder that gets it to work on the pixhawk

4 Turnigy D2836/9 950KV motors

4 HobbyKing 30A UBEC (http://www.hobbyking.co.uk/hobbyking/store/__15205__Hobby_King_30A_ESC_3A_UBEC.html)

3DR power distribution board 

1 Turnigy 2200mAh Li-Po battery 

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