Needed trainer cable new or used for TX flysky fs i6. Also needed wireless buddy box which will support the above mentioned TX .
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You can make your own buddy box cable using s-video connector available at local electrical shops.
Check this post of mine it will be helpfull
http://www.rcindia.org/self-designed-diy-and-college-projects/diy-buddy-cable-for-flysky-radios/msg243118/#msg243118

Thanks harshit

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Will you please explain me the procedure of connecting two transmitter for buddy box

Which receiver should be used ??
Of Master or of student
How to do settings in menu??
I have both fsi6
And Thanks again

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 I have posted an image showing the connection between the trainer ports of the tx's in my post pls check.rest is just solder the wires on s-video cable connector and plug on tx.

Trainer tx- menu->system->trainer mode->turn it on->assign switch
student tx-meny->system->student mode->tx will ask to enter stu.mode press ok. You will see a 's' written on screen just under the protocol name,it means you are in student mode.
now the switch assigned on the trainer tx will swap the controls between the transmitters

Any rx can be used which is supported by the trainer tx
in your case i - series recievers and flysky old recievers both can be used.

Thanks harshit

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