In my journey from building balsa free flight models to getting into radio control, the Jumper T-Lite will be the next step. After deciding to get into RC, I bought some second hand planes and two second hand transmitters, a Turnigy TGY 9X and a Spectrum DX4e. These have been great to learn on, but I want something that I’m going to be able to use for all my models and neither of these is going to cut it.
Enter the Jumper T-Lite.
As at 25 May 2021, this is a very new machine. There is a lot of excitement about it in the community, and there are a number of videos on YouTube with reviews and analysis of the machine. A lot of this is focused on quad/drone usage, but even the fixed wing fliers like myself come at it from years of experience and skip over some basic steps.
Of course you would expect this basic information to be “in the manual”, but it’s not. The 4 page “quick start” guide that comes with the T-Lite has one single page of actual instructions which pretty much focus on binding with a receiver, but don’t say what do do with the setup after that.
It’s also important to note that the version of Open-TX used by the T-Lite is pre-release. The current “stable” version of Open-TX is 2.3.11 while the T-Lite uses 2.3.12 and is dated 2021-01-14 with EEPR 219 (is that the build #? Not sure).
The Open-Tx documentation online is about version 2.2 predating even the 2.3 major release that includes the T-Lite. This is open source software of course, so its not really fair to criticize, but it is important to understand what this all means. It mostly means that to ge the most out of this very powerful gadget, you need to find bits and pieces of information all over the internet, including on YouTube, forums and blogs (like this one).
So what I’m going to try to do here is distill what I have found helpful into a bit of a real “Quick Start Guide” that hopefully will help you to get started using it. This isn’t intended to be comprehensive documentation, I hope it helps. It’s helping me to write it!
Most of the unbox videos you see online cover the basics of turning putting on the antenna (VERY important) and putting the correct 18650 lipo battery (flat top not button top) in the right way round (Positive to the right if you have the T-Lite open in front of you – check this very carefully). These batteries are pretty easy to find, I bought mine from Battery World in Vancouver.
Yes – the USB cable does charge the battery! (but it takes a few hours). You can charge batteries in a separate charger, but you don’t need one. The internal charger won’t overcharge the battery so leave it charging till the light goes off.
Turning on the Transmitter
Things like what comes up first, “Throttle warning” (mode 2). etc.
Using the Keys on the T-Lite
One of the nice things about the T-Lite is the “keypad” – the keys on the receiver. They are labeled, but it’s not really intuitive and apparently the labels rub off over time, so I’ll give you this quick reference table that might help.
|ENT||Enter||Select an item for editing, select an item from a list. Confirm action or entry|
|RTN||Return||Not “return” like on a computer keyboard, return back to the previous step, of exit out of what you are doing.|
|UP||Up||This one is pretty straight forward, move up a screen, move up a list, move to the previous item when you are selecting options. Sometimes “up” means “up the alphabet”, which intuitively seems to be going backwards because up from “F” is “E” (previous).|
|DN||Down||Opposite of UP|
|SYS||System or Left||Depending on the context, this button can mean “System” or “Left”. For example when you first turn on the radio you will be in a Model. Press SYS to take you to the main SYStem setup menu for the radio. Once you in the setup menu, MDL and SYS will take you forwards in backwards through the setup pages. Sometimes this can be confusing because you might expect “RTN” to be “go back” but sometimes it might be the SYS button you need to “go left”. So the SYS button will sometimes work as “move left” or “page left”.|
|MDL||Model or Right||When in a particular model, the MDL button will take you to the model selection screen. But if you are navigating on various screens, the MDL button will usually be a “move right” or “page right”.|
Selecting a model
When you turn on the T-Lite you will be “in” the model that you were in last time you used it.
This usually makes sense, the transmitter assumes you want to control/fly the last model you were working with, but If you want to change to a different model or create a new model, press the “MDL” button. This takes you to the model selection screen.
If you are on one of the setup pages for a specific model, you need to press “RTN” first to take you back to the main model screen. Then you can press MDL to get to the model selection screen.
Creating a new model and binding to a receiver
The quickest and simplest way to set up a new model to fly is this:
- Get to the model selection screen – usually by pressing MDL from the main model screen or system setup
- Press and hold ENT – this pops up a menu. Use UP/DN to select “Add Model”, press ENT
- You are now in a new model – you can change the name now, but its not necessary. You can always change it later.
- Press MDL to go to the “Model Setup” page.
- Press DN to move down to an empty slot.
- Press and hold ENT to popup the menu and select “Create Model”, again using ENT.
- Follow the prompts through the wizard. What is weird about the Wizard is that on each page, when you are done with the page you actually press RTN to go to the next page.
New Firmware – should you? (I say don’t for now)
At this point (25 May 2021), I’d say don’t update the firmware. The version that comes out of the box is good and it works. I flashed a new ‘nightly build’ firmware I downloaded using Open-TX companion and all the gimbals and switches stopped working. I had to “Factory Reset” (see below) in order to get it back from the dead.
The standard Open-TX companion (stable release 2.3.12 or earlier) will not work with the T-Lite as at 25 May 2021. Until Open-TX officially declares 2.3.13 or higher as a new stable release version, T-Lite is not available as an option and you won’t be able to use it with your radio. If you do (I tried) you might even brick it. Recovering is doable but not fun, so just don’t try.
Update as at 24 June 2021 2.3.13 has been released and the Jumper T-Lite is now supported by the Open-TX companion.
One thing to watch out for (maybe only on the Mac), when you first plugin the transmitter to the USB port it can take a long time for the “T-LITE” drive to mount and show up as a device on your Mac. Until it does, Companion will not be able to read or write models. It says it can’t find the radio. Just be patient. Sometimes VERY patient, but it will get there eventually.
If you are hooped – your transmitter is messed up and nothing seems to be working. You get multiple warnings when you boot and you don’t know what is going on, it might be time for a “Factory Reset”. Luckily this is easy – but its tricky to find. This is how you do it:-
- Power off and restart your T-Lite
- Press SYS to go to the Radio System menu
- Press MDL (how many times) to get to the Radio Setup page.
- Press DN to go to the Factory Reset option
- Press ENT to select Factor Reset – you are not done yet.
- Press ???