I recently bought the Phoenix R/C simulator. It comes with its own USB-cable to plug into your remote controller’s trainer cable. A friend of mine has a Spektrum remote, and the stereo 3.5mm jack plugs right is.
I have a Futaba FF9 remote, so they wanted me to buy the “adapter cable to FF9” for €16. Since I already had the pinout of the FF9-connector figured out, I figured I could make this cable myself.
Since the FF9 connectors are hard to find, I wanted to reuse the one I have. So I worked out a wiring scheme that would allow me to connect pretty much everything to everything.
The standardized interface
I chose an RJ45-jack (officially called 8P8C), since they’re easy and cheap. I got my inspiration from the RS232-over-RJ45 idea:
- not connected
- not connected
- ground (output)
- signal out
- signal in
- ground (input)
- sim signal
- sim signal
I numbered the connector ((c) David Monniaux) from right to left, but as long as you are consistent it should work. The two sim signals are shorted on the slave-side. On my FF9, that activates simulator mode: switch on the device, but without HF-transmitter on.
Note that by simply crossing over the pins, the output is fed into the input of the other remote. My “master-slave” cable does this crossing for pins 3, 4, 5 and 6; it also shorts pins 7-8 on the slave-side.
FF9 pinout
My FF9-cable now looks like this:
- not connected
- ground – connected to RJ45 pins 3 and 6
- signal out – connected to RJ45 pin 4
- sim signal – connected to RJ45 pin 7
- sim signal – connected to RJ45 pin 8
- signal in – connected to RJ45 pin 5
Phoenix pinout
The phoenix cable terminates on an 3.5mm male mini stereo jack ((c) Dinesh Pratap Singh) (officially TRS connector). So I tied together a female socket and an RJ45 connector:
- sleeve – ground – connected to RJ45 pins 3 and 6
- ring – ??? – not connected
- tip – signal in – connected to RJ45 pin 5
Roly says:
Thanks for the info. I want to make the Phoenix USB cable for my Spektrum DX4e. I thought I could butcher an old USB cable and put a 3.5mm jack on one end. Any chance of you telling what the pin-out match-up is for the USB and 3.5mm jack ends of the Phoenix cable ?
2012-01-02, 9:36Thanks in advance.
Niobos says:
Roly,
The Phoenix USB interface acts as a kind of dongle, so there is a microchip in between the USB and the 3.5mm jack side. And even technically speaking, it will not be possible to just map USB-pins to 3.5mm pins.
If you do want to make your cable yourself, I would recommend you to take a look at SmartPropoPlus, which uses the line-in of your sound card to read the Tx.
Niobos
2012-01-02, 9:55