Hi newbie here looking for radio advice, does anyone on here have any advices on either of these radios for the Arducopter 2, I cant seem to make my mind up on these, I like the Dx8 because of the telemetry and additional channel but Futaba seems to have a bigger following HELP please.
Hitec could be a good choice and less expensive than Futaba. I'm using Aurora 9. This is one channel more and very usefull touchscreen. Do have telemetry as well in the 2.4 Ghz version. Give receiver voltage plus auxiliary voltage without added hardware.
It is easy to setup the dual switch for mode change (6 differents flight modes with two switches). The good news is that you do not wast a channel doing this mixing. Not always the case with other radios.
Here is the channels you'll need with an ACM2 multi :
Ch1 - 4 : flight control (mandatory)
Ch5 : flight Mode selection (optionnal)
Ch6 : custom PID or special function (optionnal)
Ch7 : Trimming helper (optionnal)
Ch8 : Free for custom use (optionnal)
Ch 9 : Free for custom use (optionnal)
When you have tried a radio with a touchscreen, you don't want to go back anymore.
Why not just use a diode?? Sure you lose 0.7V but that doesn't matter. A 1N4002 will handle 1A continuously, and withstand 100V reverse.
To be clear, in the diagram above replace the FET with a diode of suitable current rating, anode at the top to the battery, cathode (marked end) at the bottom to the radio, no third connection on the side to the negative rail.
The diagrem shown above has the drain and source of the MOSFET swapped. If you wire it as shown it will work OK in the forward direction, but won't block the reverse direction due to the body diode in the MOSFET.
Look at the symbol for the MOSFET - it shows the body diode in the direction that will conduct when the battery is reversed. Figure 2 and Figure 3 of the posting linked to in the reply above shows correct schematics. The discussion following that post also describes the error.
A series diode will work for battery protection and the voltage drop for a low current application like an RC transmitter doesn't really matter. However, if you use a lipo battery an external charger won't be able to see the battery voltage through the diode, so it won't start if it's a lipo charger that expect to measure the battery voltage before applying charging current. The MOSFET circuit will address this issue.
Thanks to everyone for commenting. will probably go for a Spektrum DX8 turnigy is not so cheap here as in the States and it will be a pain to have it shipped over as everything in Spain from the US gets a canning here in Customs!!!
Good Choice! The DX8 is a high quality radio, Extra receivers are easy to come by and there are many options to choose from.
BUT THE MOST IMPORTANT : The Dx8 is one of the only 2 or 3 radios in the world that have totally asignable trainer function. This is vitally important if you need FPV head tracking capabilities. (The Futaba 10Cap is the other one I know of.) Since you are playing with Quads, I assume Camera Work later?, This will lead to FPV flying, beleive me.
Turnigy x9 users: please check for me if your radio can do this : Go to the trainer menu item, and see of you can enable/disable any channels APART from the main 4. (Aileron, Elevator, throttle, rudder). Would be nice to know.
Hitec do have custom training as well. You can choose for each channel three states : leave total control, partial control with 50% mixing, or no control at all.