Update 04/27/2012 – Good news. It looks like there is no more need to cut the trace and solder in the resistor as demonstrated in this post unless you’re still running stock firmware.
The latest ER9X firmware has a an option call “Enable PPMSIM” in the Radio Setup screen. It allows you to turn it ON and the er9x firmware routes the PPM signal to the trainer port through a alternate path. Therefore, it bypasses the module and thus the need to add the resistor.
Original Post below…
Here’s my quick writeup on the trainer port resistor mod.
First, some helpful links to original articles on this. They contain a description of the problem and the solution.
- Original PDF on “Fixing the 9x PPM in problem”
- A more visual description of the issue and illustrated steps to fix.
- An updated version of the above with a video.
I prefer to use version 3.
The reason is because it has since been discovered that the problem only appear to affect the Turnigy 9x module. Others have noted that using an Assan module or FrSky module in the back doesn’t exhibit the issue.
Therefore, instead of modding the transmitter. We are going to apply the fix to only the Turnigy module. This is also simplier because you only have to unscrew two screws instead of the 6 screws + unfasten a wire harness to gain access to the Turnigy rear board.
Please follow the above video for a howto. It’s pretty simple and well done.
- Use a 1k resistor. (I chose to use SMD)
- Cut the trace with an xacto knife or file.
- Solder on the 1k ohm resistor. (surface mounted 102 resistor)
Here’s the module taken from the MLP4DSM transmitter that comes with E-Flite RTF kits. It shows the wiring necessary for hookup to the Turnigy 9x running custom firmware that supports the DSM2 protocol.
See this post for location of the 3.3v pad to solder the red wire to.
I added an LED inline with the PPM signal wire. Because the LED is a diode, it drops the voltage of the PPM line from 5v to the 3.3v that the DSM2 module can handle.
To protect the entire assembly, I used 1/2″ clear shrink tube. The clear shrink tube allows me to see the status LED onboard the DMS2 module.
Everything is working great with the latest th9x firmware. I was able to bind to my mSR by holding the trainer switch while powering up the transmitter.
On the er9x front. Mike Blandford was able to get the th9x source code properly added to the er9x firmware. Use build r635 or later. I was successful in using his firmware in connecting the Turnigy 9x TX to the mSR. Great job Mike!
This setup continues to work without a hitch for me. I have since bound to and controlled the following Blade models successfully: mCX2, mSR, mCP X, 120SR and mSR X.
The Turnigy 9x runs internally at 5v. But it also has a 3.3v regulator on the main board that is used to power the LCD. Here are a few of the locations of the 3.3v points that you can use. Make sure whatever unit you’re connecting to that 3.3v regulator doesn’t draw too much current or else you’ll get rebooting of the Turnigy 9x.
I am working on hacking the MLP4DSM TX module into the Turnigy 9x. This will allow for Spektrum DSM2 capability so I can control my helicopters using the DSM2 protocol. I will write up a more detailed post once I get all the details worked out. I got it working this morning and I was able to bind and control my mSR using the Turnigy 9x. I just need to tidy things up and come up with some step by step instructions.
Here are the pin outs from the MLP4DSM board. You’ll need to supply it 3.3v using a regulator.
Interesting development. It appears that in some market, the Great Wall Xieda 9958 and 9998 has rebranded cousins…
Here’s a couple of Nincoair Micro Evo 190 that appears to use the same canopy and parts as the Xieda 9958, which means that the canopy will fit the Xieda 9998 as well.
Unfortunately, these units are found from an overseas online shop: http://shop.lindinger.at.
I recently purchased a Turnigy 9x and am in the process of setting up my preferred throttle curves for it. So I figure I’d share.
From my understanding, being able to set your throttle curve is the benefit of setting up the initial profile as a “heli” instead of “acro”.
To get to the throttle curve section of the menu, hold down the menu button. Select Settings. Then select THR/CV.
Owners of the 9x will know that the F.Mode switch can be toggle between three settings: N, 1, 2 correlating to Norm, ID1, ID2 in the menu.
I think I will make the ID1 settings my Normal in the future. My ID2 position currently has a rudder to elevator mix that I am experimenting with. Being able to quickly switch between different settings in mid flight allows you to do a A:B comparison and makes it easier to find the combination of settings that fits your flying style.
I’ll post more as I complete setting up and fine tuning the Turnigy 9x with the Xieda 9958.
Side note: You notice that the stock 9x firmware gives you the ability to adjust 5 different points on the curve. Similar to the Spektrum family of TX. This is one example of where the custom firmware like Er9x shines. They allow 9 points on the throttle curve. For those who need absolute control. Obviously overkill for a micro heli like the 9958…but it’s one example of the power the Turnigy 9x posses with a custom firmware flash to it.
The range on the Xieda 9958 isn’t that great. If you open up the transmitter, you’ll notice that there is no antenna wire connected to the 2.4ghz module. For comparision, take a look at the inside of the E-Flite MLP4DSM transmitter.
I am currently testing out how mounting the battery lower affects the flight characteristics of the 9958. It seems like it’s improving the pivot on bank turns…but I need further testing and/or feedback from others.
The folks at E-Flite just released a new fix-pitched micro heli. It’s similar to the popular mSR except it’s flybarless courtesy of the AS3X Digital Flybarless system that’s already in used on the mCP X.
The new mSR X is touted to be a intermediate step up from the mSR, and not a replacement. Along with the upgrade to flybarless, they fixed some of the annoying things that initially plagued the mSR. Like the new cage around the tail motor which will help prevent the motor cap from popping off and destroying the brushes.
The mSR X comes with new 150mAh LiPo. Hopefully they are good quality cells, because it’s actually priced pretty reasonably at $3.99.
The mSR X is scheduled for a mid December 2011 release. Horizon Hobby will be demoing this new heli at the iHobby Expo being held this week in Chicago. I personally can’t wait to see how it flies and the mods that will inevitably come up for it.
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