Internal Wiring Modifications For Futaba 9C With Spektrum Module
Does not require any additional items and totally reversible.
Your warranty is probably voided by this modification. Do so at your own risk!
1. Open up the Spektrum DM8 module by removing the four hex head screws from the case. Remove the nut and lock washer from the connector. Carefully remove the circuit board from the case. Make sure you donβt lose the bind button.
2. Using a Dremel with 1/8β diameter cutter or file, cut a notch in the lower half of the case as shown.
3. Re-route the antenna wire to the bottom of the case through the βUβ shaped cut-out in the circuit board and out through the case in the notch that you created.
4. Put the bind button and case top back on. Reassemble with the four hex screws.
5. Remove the back of the 9C transmitter by first removing the battery and then unscrewing the four Phillips head screws from the back side.
6. Drill a 3/8β dia hole in the bottom left corner of the recess that the RF module sits in. Using a Dremel with a 1/8β dia cutter or file, elongate the hole so that it goes up the sides of the recess. Be careful not to cut through the case. This hole should line up with the connector/wire that extends out of the Spektrum module.
7. Cut a notch in the top of the case where the antenna normally exits. This is to allow the 2.4GHz antenna coax to enter the case.
8. Cut a notch in the plastic antenna mounting post.
9. Screw in the antenna mounting post and attach the antenna. Route the coax into the case as shown in the pictures.
10. Plug in the Spektrum module into the transmitter case back. Pass the connector through the hole and then snap the module in place.
11. Connect the antenna coax to the connector from the Spektrum module. Careful here! There is not much room to work as the wires are short. Wrap the connection with two layers of electrical tape. Make sure no bare metal is exposed. Secure tape with plastic tie-wraps to ensure it doesnβt come loose and short out something.
12. Carefully reassemble the case back to the transmitter. Take your time and make sure the front and back case align correctly. Itβs a bit of a juggle to align the antenna wire, the pins of the RF module and make sure the connector is clear of the circuit board.
13. Once the case back is in place, secure with the four Phillips head screws.
14. Cover the hole in the Spektrum module with a piece of sticky Monokote trim sheet.
15. Re-install battery and cover.