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Old Dec 06, 2012, 10:16 AM
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Modifying Hobbyzone / Parkzone / Eflight RTF Transmitters

So has anyone done anything with these little RTF Nintendo l;ike transmitter? I wouldn't even bother but my son is flying a Firebird Startos and I noted he keeps trying to steer the plane on the ground with the left stick, like I taught him on his micro planes, and I would like to tie the left stick to the right stick. On our other 3CH planes we can use out DX6i to map the channels, but the Startos is limited to the red transmitter.

My plan is to crack one one of the extra toy transmitters I have and compare it to the Startos internals, if they seem the same I was going to experiment with cross connecting the left stick input across the the right stick with may some wires. Not sure what will happen which is why I'll try it first with a spare and see how our 3CH micro cub works. If anyone has tried this or has any guidance I would appreciate hearing about it.
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Old Dec 06, 2012, 09:55 PM
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Ok since I didn't hear anything I decided to experiment at home tonight. I was successful in linking my left (rudder) stick to my right (aileron) stick! I disassembled an old Eflight controller first by removing the back (four screws), sliding out the battery connectors and then removing the circuit card (four screws from the control.

I looked at the gimbal controllers and noted which direction had the rotation for the rudder and aileron movement, which tuned out to be the bottom ones. I then made a jumper wire to experiment with which post, there are 3, that needed to be linked together. As it turned out it was the middle one which immediately linked the two control inputs. Now I needed to solder on the jumper wire on the board. First tin the wire a bit and then very briefly touch the center post connection with the iron. You need to be quick and steady since these connections are very close together. I say unless you are use to working on electronics with heat you might want to find someone who has the experience.

Tomorrow I'll do some test flights with our little micro cub to verify control in flight and no other issues.

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Description: Back view with jumper wireName: DSC07113.jpg
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Description: Close up of back side of left (rudder) connection to center post.Name: DSC07116.jpg
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Description: Close up of back side of right (aileron) connection to center post.
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Old Dec 06, 2012, 10:33 PM
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My understanding is that the Stratos uses a different transmitter from the UM models and is not compatible with DSM2. One reason, presumably, for going to a different transmitter is to get longer range than the regular little MP4DSM.
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Old Dec 06, 2012, 10:52 PM
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Showing the movement is now linked between the two controls.

100 0292 (0 min 44 sec)
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Old Dec 07, 2012, 12:02 AM
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What happens when they are both moved in opposite directions at the same time?
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Old Dec 07, 2012, 06:54 AM
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Good question, I just checked, the right stick overrides the left stick input. I had full left by rudder and added full right aileron and the control surface moved to from full left to full right.

I decided to do my experiment with a spare transmitter because I know the Stratos is specific to the plane. If they had made this a BNF plane I would be a lot happier.
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