Upgrading Jumper T20S to AG01 Gimbals: A Challenge Worth the Effort?

by Oscar
Installing Ag01 Gimbals In The Jumper T20s Radio Calibration

I’ve had a bit of a love-hate relationship with the stock gimbals on the Jumper T20S radio. They do get the job done but they also deserve an upgrade. The T20S has room for full-size gimbals, and the AG01s seemed like they could fit.

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To learn more about radio check out my buyer’s guide: https://oscarliang.com/radio-transmitter/

This DIY hack is inspired by becky9’s guide on Thingiverse.

Benefits of the AG01 Gimbals

Whether or not the AG01 gimbal is worth its $130 price tag, is up for debate, but in my personal experience there’s no denying that they do feel superior than the stock gimbals that come with the TX16S, Boxer as well as the T20S. Here’s why I’m excited to bring them to my radio:

  • Smoothness in movement
  • Enhanced precision
  • Having M4 stick ends, offering a more solid grip compared to the T20S’s smaller M3 stick ends

What Do You Need?

Get the T20S Radio from:

Get the AG01 Gimbals from:

For this upgrade, there are a few specific items you’ll need to ensure a smooth installation process.

JST 1.25mm 4-pin and 6-pin connectors, get them from AliExpress in pairs so you don’t need to worry about male or female: https://s.click.aliexpress.com/e/_Ddd1txp

Installing Ag01 Gimbals In The Jumper T20s Radio Buy Jst 1.25 4 Pin 6 Pin

M2.3 Self-tapping screws, get them from AliExpress: https://s.click.aliexpress.com/e/_Dm5SVVz

While the original suggestion was for 16mm screws, I found them excessively long and difficult to drive in completely. I recommend 14mm screws for an easier fit. An assortment kit with various lengths would be ideal actually, giving you options to find the perfect fit.

Installing Ag01 Gimbals In The Jumper T20s Radio Buy M2.3 Self Tapping Screws

3D printed spacers: https://www.thingiverse.com/thing:6202025

These are are crucial if you want to avoid permanent alterations to your T20S by removing the plastic pins inside the housing. These spacers not only maintain the integrity of the radio but also lower the gimbals by about 5mm. This allows you to make the stick longer, which consequently making the stick travel longer and giving you more precise control.

Installing Ag01 Gimbals In The Jumper T20s Radio 3d Print Spacers

Additionally, you’ll need a rotary tool to cut the corners of the AG01 Gimbals. This is what I used, Greenworks 8V rotary tool. This tool is also handy for any necessary modification within the radio’s plastic housing: https://oscarliang.com/greenworks-8v/

Greenworks 8v Rotary Tool Grinding Drilling Polishing Cutting Unbox

Installation Steps

Gimbal Wiring

Before diving into the hardware, it’s important to address the wiring connections.

The T20S gimbals have 4 wires, signals for the two axes, plus power and ground. The AG01, however, comes with 6 wires due to the duplication of power and ground wires.

Installing Ag01 Gimbals In The Jumper T20s Radio Adapter Cable 6 Pin To 4 Pin

You can simply solder the duplicated power and ground wires together when connecting to the T20S. Personally I prefer to use an adapter—it simplifies the connection without modifying the AG01’s original harness, allowing you to use these gimbals in other radios in the future.

Note that the T20S gimbal wires color code doesn’t make sense, follow Becky9’s wiring diagram (or the one below) instead.

See the following diagram for the wiring of the adapter.

Installing Ag01 Gimbals In The Jumper T20s Radio Adapter Cable

Cutting AG01 Corners

The most challenging part of this upgrade is perhpas cutting the AG01’s corners. See the yellow dashed lines in the following picture.

Crafted from sturdy 4mm thick aluminum alloy, it’s a formidable task. Because I only have a small rotary tool and a miniature disc blade, it took me over 20 minutes to trim each corner. And don’t worry, the modification doesn’t compromise the gimbals’ compatibility with other radios.

Installing Ag01 Gimbals In The Jumper T20s Radio Cut Corners Rotary Tool

Swapping Gimbals

To remove the original T20 gimbals, you’ll unscrew four screws per gimbal.

Installing Ag01 Gimbals In The Jumper T20s Radio Remove Original Insert Spacers

I am using 14mm M2.3 self tapping screws with these spacers.

Installing Ag01 Gimbals In The Jumper T20s Radio Screw Length

As you can see, you need to trim the AG01’s corner because the T20S’s PCB obstructs a direct fit (as circled below).

Installing Ag01 Gimbals In The Jumper T20s Radio Cut Corners

Connect the gimbals using the adapters we made earlier.

Installing Ag01 Gimbals In The Jumper T20s Radio Jst 1.25 Adapter Cable 6 Pin To 4 Pin

Potential Issues

Not sure if this will happen to eveyrone, but a couple of hurdles did come up for me during the gimbal upgrade.

Firstly, the left slider scraped against the throttle stick tension bars screws. Changing those screws to button head fixed that.

Installing Ag01 Gimbals In The Jumper T20s Radio Slider Scraping Screws

Second issue was the gimbal arms brushing against the back housing due to the 5mm drop from the spacers. I had to shave off some plastic from the inner side of the housing.

Pro tip: apply a little hand cream on the tips of the gimbal arms can reveal exactly where the removal of the plastic was needed (as circled below).

Installing Ag01 Gimbals In The Jumper T20s Radio Arms Scraping Back Housing Check

Here’s the end result, the gimbals finally can move smoothly without touching the back housing.

Installing Ag01 Gimbals In The Jumper T20s Radio Arms Scraping Back Housing File Remove Plastic

Reassembly

Once the gimbals are functioning smoothly, it’s time to reattach the back housing.

Installing Ag01 Gimbals In The Jumper T20s Radio

Calibration

Post-installation, calibration is key. You can access the calibration settings in the “Hardware” page, reached by long-pressing the Menu button and cycling through with the Page button.

Installing Ag01 Gimbals In The Jumper T20s Radio Calibration

Conclusion

And there you have it—the AG01 gimbals are now be part of your T20S!

If you encounter any questions feel free to reach out in the comments. For insights into how I’ve setup my T20S, check out my comprehensive guide: https://oscarliang.com/setup-jumper-t20s-radio/

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8 comments

Ray 4th February 2024 - 12:26 pm

Also curious, where did you acquire the connectors for the adapter? Not looking to chop the connectors myself, aswell.

Reply
Oscar 5th February 2024 - 4:32 pm

I made them myself, links are in this section: https://oscarliang.com/install-ag01-t20s/#What-Do-You-Need

Reply
Ray 4th February 2024 - 12:24 pm

I can only assume… That you could pop in “stock” boxer or TX series gimbals, that someone has laying around after upgrading to AG-01 gimbals. That would be an extremely cost effective upgrade as well it seems. I’m going to go ahead and purchase a T20 with hall effects and hold out for AG-01s or “stock” RM gimbals now. Thanks!

Reply
Brian 17th December 2023 - 3:18 am

If you reduce the thickness of the 5mm spacer to 4mm, do you think the back housing will need to be shaved?

Reply
Oscar 17th December 2023 - 4:58 am

maybe not, but I am not entirely sure. But again, the plastic pins in the front housing will be too long and will need to be shortened somehow.
if you want to avoid shaving the back housing, then maybe you want to consider not using the spacers.

Reply
dr00minFPV 30th November 2023 - 8:06 pm

Wow, I am edging towards doing this, I will have to have a feel of my mate’s AG01’s again and really think about it.

Thank you for doing this!

Reply
ErlandLie 8th November 2023 - 5:20 am

This is absolutely an experience expert advice ^_^
At indonesia, aliexpress has been banned to to government regulation, shopee too, it means,
We as fpv hobbiest, cannot buy any_thing from chine or overseas, too bad… not everything available in indonesia, and now even worst after this premature policy….

Reply
Luis Agustín 5th November 2023 - 2:19 pm

Is it possible to make this conversion to an FrSky X18?? I’m aware that mounting holes doesn’t match, but I’m sure it might be possible to make an spacer with different holes able to fix the gimbals. I’m more worried if the hall sensors will work with the X18 main board.

Reply