Again in 2023, I visited RadioMaster’s workplace in Shenzhen, China, and the boss confirmed me a prototype radio they had been engaged on that ran on Android. Quick ahead 3 years, they usually’ve lastly launched it. The RadioMaster AX12 is the corporate’s first Android-based RC radio. It basically combines an FPV radio with an Android cellphone/pill, permitting you to run Android apps immediately on the transmitter. You’ll be able to even use it to show an FPV video feed through HDMI. I believe the AX12 is a genuinely attention-grabbing product — nevertheless it’s additionally very area of interest. Right here’s my tackle what it does effectively, the place it falls brief, and who ought to severely take into account it.
Study extra about FPV radios: https://oscarliang.com/radio-transmitter/
The place to Purchase
Get the AX12 from:
Included Equipment:
- 1 × AX12 Signature Carry Case
- 1 × USB Kind-A to Kind-C cable
- 1 × USB Kind-C to Kind-C cable
- 1 × Display protector
- 1 × 1.5mm hex wrench
- 4 × Low-tension gimbal springs
- 1 × Stickers
- 1 × Guide
Specs
- Processor: 8-core CPU
- Reminiscence / Storage: 4GB RAM + 64GB storage
- GPU: ARM Mali-G72
- Working Present: 1.10A (at most output energy)
- Frequency Vary: 2.4GHz or Sub-G 900MHz
- Inside RF: ExpressLRS 2.4GHz / Sub-G 900MHz
- Supported Protocol: ExpressLRS
- Channels: As much as 16 (relying on receiver)
- Show: 5.5-inch HD touchscreen (1280×720), 1000 nits brightness
- System Firmware: Android 9.0 (can’t be up to date)
- Radio System/App: RadioMasterOS
- Charging: USB Energy Supply (PD) appropriate energy provide required
- Gimbals: Excessive-precision X5 Corridor gimbals (non-obligatory AG01 Nano improve)
- Gimbal Sticks: Detachable and storable
- Exterior Module Help: Nano module bay
- Battery: Twin built-in 3.7V 21700 10000mAh lithium batteries
- Firmware Upgrades: On-line automated updates through Wi-Fi
- Dimensions: 171 × 168 × 73 mm
- Weight: 640g (Claimed), 649g (Measured)
What Is the RadioMaster AX12?
The only technique to perceive the AX12 is that this: it’s basically an RC radio constructed round an Android cellphone/pill.
Left: TX15; Proper: AX12
As a result of it runs Android, you possibly can set up apps reminiscent of:
- QGroundControl
- FPV simulators
- Betaflight instruments
- SpeedyBee app
- YouTube
- Web site Browser
- And extra…
One other standout characteristic is that it may show an FPV video feed immediately on its built-in display screen utilizing HDMI enter. It additionally has HDMI output, so you possibly can mirror the show to an exterior monitor — which is nice for occasions or sharing your feed with pals.
Design, Construct, and Ergonomics
At first look, the AX12 seems to be a bit just like the DJI Good Controller. However internally it’s one thing very completely different: an Android-based radio with a 5.5-inch touchscreen, built-in ExpressLRS, HDMI enter and output, Wi-Fi, Bluetooth, and help for Android apps from the Play Retailer or APK.
It is available in a pleasant carry case with an interior zip pocket. The sticks might be saved on the again of the radio and screw into the gimbals when wanted.
It makes use of mini Corridor gimbals, just like these discovered within the RadioMaster Pocket, and they are often upgraded to AG01 Nano gimbals. The stick peak is just not adjustable, so if that issues to you, you’ll want aftermarket stick ends. It additionally feels extra suited to thumbers than pinchers or hybrid pinchers.
There’s a neck strap hook, which is essential as a result of at round 649g, this isn’t a light-weight radio. It additionally feels bottom-heavy as a result of massive display screen and battery placement. When utilizing a neck strap, the underside tends to droop, so the stability isn’t ideally suited. Nonetheless, the lanyard is just not included and must be bought individually.
Within the hand, I’ve to say the ergonomics are a bit missing. It resembles a DJI Good Controller, nevertheless it doesn’t really feel fairly as refined or comfy. It’s clearly designed across the display screen first and the radio second.
Left: TX15; Proper: AX12
Display
You would possibly discover there aren’t any conventional menu buttons on the AX12. That’s as a result of all navigation is finished through the touchscreen — similar to a smartphone.
The AX12 has a 5.5-inch 1280×720 touchscreen (related in dimension to an iPhone 8 Plus), and one of many first issues that stood out to me is how vivid it may get, RadioMaster claims as much as 1000 nits, and primarily based on my impression, daylight visibility shouldn’t be a problem in any respect.
Brightness and quantity management work precisely like they do on an Android cellphone — swipe down from the highest of the display screen to disclose sliders.
There are Mini HDMI enter and output ports on the highest of the radio, permitting you to show FPV feed on the display screen. Appropriate methods embody DJI, Walksnail, and HDZero — so long as they’ve HDMI output, you possibly can join them to the AX12 and use it as a show.
You may as well mirror the show to an exterior display screen through HDMI out, which may very well be very helpful for occasions, demos, or group classes.
Android Expertise
The AX12 runs on Android 9, and the radio system that replaces EdgeTX is actually an app known as RadioMasterOS that runs on prime of Android.
The upside is flexibility. The draw back is that Android 9 is kind of outdated (launched over 7 years in the past — the most recent model is Android 16 on the time of writing), it’s now not thought of safe. Should you sign up to the Play Retailer, you must in all probability use a throwaway Google account and keep away from storing any delicate private information on the machine. App compatibility may also worsen over time, and a few apps have already dropped help for older Android variations. And Radiomaster clearly states within the specs that Android can’t be up to date.
So whereas the AX12 is spectacular as an idea, that is additionally considered one of my greatest long-term issues.
Making an attempt Some Android Apps
As a result of it runs Android, you should use Android-based simulators immediately on the radio. Which means a doubtlessly absolutely self-contained observe machine — no further controller required.
Efficiency was combined, although. Less complicated video games ran effectively sufficient, whereas extra graphically intensive ones confirmed slight lag, body drops and stuttering. That’s not stunning, because the GPU efficiency is roughly corresponding to an affordable cellphone or pill from 7 years in the past.
Nonetheless, the comfort issue is large. Having a radio and simulator in a single machine is undeniably interesting. That is the place the AX12 clearly does issues conventional EdgeTX radios merely can not.
FPV Simulators
Can it run FPV simulators? Sure.
I downloaded the free FPV.Skydive, and it ran moderately effectively. FPS sometimes dropped from 55 to 40 vary, which confirms the {hardware} is struggling, nevertheless it was nonetheless usable.
Getting the gimbals working was much less ideally suited. There’s no inner wired connection, so the work round was to attach the gimbals to Android through Bluetooth — just like pairing an EdgeTX radio with a cellphone. Sadly, latency was very excessive (in all probability round 1 second), making it nearly unflyable.
You should use the touchscreen controls as a substitute, however that defeats the aim of training FPV flying. Hopefully RadioMaster can enhance this latency sooner or later.
Betaflight Configurator
Can it run Betaflight Configurator? Brief reply: not likely.
Sure, you possibly can open the web-based Betaflight Configurator in Chrome, however the radio couldn’t detect a flight controller linked through USB-C. The FC obtained energy from the radio, however the AX12 itself didn’t acknowledge the USB machine in any respect. I additionally tried a USB-C OTG cable — identical consequence.
Nonetheless, the SpeedyBee app did work.
Once I tried downloading the Speedybee app from Google Play, it requested for a bank card (I used to be utilizing a burner account so I didn’t wish to enter it). Happily, you possibly can obtain and set up the APK immediately from SpeedyBee’s web site. USB connection nonetheless didn’t work, however Bluetooth did — I linked utilizing a SpeedyBee Adapter 3 on the drone aspect, and the whole lot functioned usually.
DJI Fly App
DJI goggles don’t have HDMI outputs, which suggests you usually want a DJI Good Controller (round $500) in case your need video output through HDMI. The AX12, nevertheless, helps video output from DJI goggles by means of a USB-C cable utilizing the DJI Fly app. This can be a very compelling characteristic — it successfully turns the AX12 into an exterior show for DJI methods. You’ll be able to even use the AX12’s HDMI output to reflect the feed to a TV or monitor, doubtlessly changing the way more costly DJI Good Controller.
Getting it to work was somewhat irritating, although. I deliberately tried to determine it out with out asking RadioMaster for assist to gauge real-world usability — and it turned out to be removed from simple. With such a brand new platform, documentation is scarce, and troubleshooting includes lots of trial and error.
I put in the DJI Fly APK from DJI’s web site, and the app itself ran high-quality. Nonetheless, the AX12 initially didn’t detect any USB connection in any respect.
To get it working, I needed to allow USB Debugging in Developer Mode:
- Go to Settings → System → About pill
- Faucet
Construct Quantity7 occasions to allow Developer Mode - Return to Settings and seek for
USB Debugging, then allow it - If it nonetheless doesn’t work, strive disabling Developer Mode, restarting the radio, and repeating the method
Additionally be certain that “HOST” within the fast settings menu (between the Wi-Fi and Bluetooth icons) is disabled.
You have to use a really particular cable. For some motive, USB-C to USB-C OTG cables didn’t work with the AX12 (regardless that those self same cables labored completely with my Pixel 8 cellphone).
The one setup that labored for me was a USB-A to USB-C cable, with a USB-A to USB-C adapter.
You additionally want to attach the USB-A finish to the goggles (utilizing the adapter) — reversing the cable path doesn’t work. Very odd, nevertheless it’s working!
This labored for each DJI Goggles 2 and Goggles 3 in my testing. It must also work with Goggles Integra and Goggles N3, though I haven’t examined them personally.
Net Browser
Need to rapidly have a look at my web site within the area? You are able to do it on the radio, how cool is that? 🙂
YouTube and Media Use
Watching YouTube works surprisingly effectively.
The display screen decision is barely 720p, so video high quality isn’t wonderful, nevertheless it’s completely watchable — and that is alleged to be a radio, in spite of everything. I didn’t set up the Youtube app as a result of Google Play stored asking me for a bank card, so I merely used YouTube within the browser with out points.
Downsides of the Android AX12
The most important weak spot of utilizing Android is complexity.
EdgeTX radios are fashionable as a result of they’re:
- Quick in addition
- Goal-built for RC use
- Light-weight with minimal background processes
- Secure and predictable
- Low value
Android introduces the alternative:
- Lengthy boot occasions
- Greater battery consumption
- Better threat of crashes or lag
- App compatibility points
- Storage and permission hassles
- Distractions on a tool meant for controlling an plane
It’s value noting that whereas most EdgeTX radios energy on in a few seconds, the AX12 takes practically 40 seconds in addition — extra like a smartphone or laptop.
One other sensible concern is developer help. A radio like this solely turns into compelling if there are literally good apps made for it. In any other case it finally ends up feeling like an outdated cellphone bolted onto a transmitter.
And it’s a really new system — bugs are to be anticipated, and you have to be ready for a substantial quantity of tinkering to get issues working. Should you’re not tech-savvy, you might discover it fairly irritating.
Inside ExpressLRS Module
The AX12 contains an inner ExpressLRS transmitter with a most output energy of 250mW. It might probably function on:
- 2.4 GHz
- or 868/915 MHz
- however not each concurrently
This implies it doesn’t help Twin-band Gemini-X. You have to select one band or the opposite, just like the TX15 however with decrease RF output.
You will have full entry to ExpressLRS settings within the radio menu, or ELRS Lua script.
There’s additionally a Nano module bay on the again, which is helpful if you wish to add a higher-power ExpressLRS module.
Connectivity: Wi-Fi & Bluetooth, however No SIM or GPS or Digicam
The AX12 contains built-in wi-fi connectivity:
Nonetheless, it lacks a number of options generally discovered on smartphones and tablets:
- No SIM card slot
- No built-in GPS
- No accelerometer
- No digital camera
In observe, this implies if you would like web entry within the area, you’ll must tether the radio to your cellphone (hotspot).
The absence of GPS is a little bit of a double-edged sword. On the constructive aspect, it avoids privateness issues and reduces background providers. On the draw back, it limits future capabilities reminiscent of location-aware options, ground-station features, or potential Distant ID integrations.
HDMI Enter: Viewing FPV Feed on Constructed-In Display
That is arguably some of the essential options of the AX12.
The radio features a mini HDMI enter, permitting you to show an exterior video supply immediately on the built-in display screen. In concept, this allows you to use the AX12 as a compact FPV monitor.
Most FPV methods with HDMI output are appropriate, together with:
- Walksnail Avatar
- HDZero
- OpenIPC
- Walksnail Ascent VRX
- Doubtlessly DJI methods (with extra {hardware})
- Helps 1080p and 720p as much as 60hz
Nonetheless, there’s a important caveat: latency.
As a result of the video sign passes by means of Android and is processed in software program, extra delay is launched (various from system to system). Which may be acceptable for spectating or monitoring autonomous plane, nevertheless it’s not ideally suited for piloting guide FPV drones the place low latency is crucial.
So sure — you possibly can watch FPV feed on the AX12 display screen, however I’d not take into account it a real substitute for FPV goggles when exact guide management is required.
HDMI Output: Sharing the Display
The AX12 additionally incorporates a mini HDMI output, which mirrors the Android show to an exterior monitor or TV.
This opens up a number of sensible purposes:
- Spectators watching stay flights
- Moveable area show
- Consumer viewing throughout industrial shoots
- Coaching classes and demonstrations
Latency continues to be current, however for viewing functions slightly than management, it’s not a deal breaker.
RadioMasterOS (Changing EdgeTX)
As an alternative of EdgeTX, the AX12 runs RadioMasterOS, which is actually an Android utility designed particularly for RC management.
The interface seems to be trendy and contains many options anticipated from a standard radio system:
- Mannequin profiles and templates
- Channel monitor
- Telemetry show
- ExpressLRS integration
- Inputs, mixes, and outputs
- System settings
- Lua script help
- And extra…
For a first-generation system, it’s stunning how a lot work they’ve performed. That mentioned, it’s clearly not as mature as EdgeTX. EdgeTX has years of growth and an enormous consumer base behind it, whereas RadioMasterOS continues to be new and evolving.
Battery and Charging
The AX12 makes use of two 21700 Li-ion cells for a complete capability of 10,000mAh, which is respectable for an Android machine. The batteries are contained in the radio and never detachable except you are taking it aside. RadioMaster claims 8+ hours of steady use on a full cost.
Charging is dealt with through the USB-C port on the underside. In my testing, it helps PD fast-charging as much as 20W, reaching 0% to 80% in about 70 minutes.
There’s one other USB-C port on prime which is used for:
- File switch
- Equipment
- System communication
There’s additionally a headphone jack in case you don’t wish to use the built-in speaker.
FAQ
Does this radio run EdgeTX?
No. The AX12 makes use of Android as the first platform and RadioMasterOS for radio management.
Is RadioMaster transferring away from EdgeTX?
No. RadioMaster says they’ll proceed supporting EdgeTX throughout present and future merchandise. The AX12 is an extra product, not a substitute.
Will there be a 4in1 (multiprotocol) model?
No. There are presently no plans for a 4-in-1 model.
How do you configure ExpressLRS settings?
RadioMasterOS features a built-in ExpressLRS configuration web page, together with ExpressLRS Lua script.
How do I set a bind phrase if there’s no configurator goal but?
A goal might be added quickly. For now, put the transmitter into Wi-Fi mode within the ELRS Lua script, and configure the bind phrase by means of the ExpressLRS WebUI.
Does the AX12 have FCC approval?
Sure — FCC certification is full.
Will there be CE and LBT variations?
Sure — CE certification is full, and an LBT model might be accessible.
Closing Ideas: Who Is the AX12 For?
In contrast to many radio producers that have a tendency to simply copy one another, RadioMaster is clearly pondering outdoors the field right here.
Within the product web page, RadioMaster particularly highlights MAVLink pass-through help for instruments like QGroundControl and Mission Planner. This makes it clear the AX12 is designed not simply as a transmitter, however as a mixed controller and floor station. For the appropriate consumer — particularly these constructing ArduPilot, PX4, iNav, or autonomous/mission-planned platforms — the AX12 may very well be extraordinarily helpful. At $249.99, it’s surprisingly compelling.
That mentioned, it would additionally attraction to individuals who need:
- A built-in Android pill of their radio
- FPV video viewing with out separate goggles
- FPV simulators operating immediately on the transmitter
- Area entry to apps like Betaflight instruments and SpeedyBee
- A less expensive various to the DJI Good Controller for outputting DJI feed to an exterior monitor
So sure — it’s area of interest, however not pointless.
Get the AX12 from:
For a typical freestyle FPV pilot, nevertheless, I’m much less satisfied. The Android layer provides flexibility but additionally introduces:
- Extra complexity
- Potential instability
- Safety issues
- App compatibility limitations
- Unsure long-term help
The gimbals are comparatively small, and ergonomics aren’t ideally suited for lengthy flying classes. For Betaflight quads, the AX12 doesn’t add a lot — most configuration can already be performed through OSD. And nearly everybody brings a smartphone with them these days anyway, there’s no want for one more Android machine. If all you do is arm, rip packs, and go residence, a typical EdgeTX radio nonetheless makes extra sense.
Listed here are my EdgeTX radios suggestions: https://oscarliang.com/radio-transmitter/#Radio-Suggestions
I don’t assume the AX12 will substitute EdgeTX radios for many FPV pilots. But it surely does introduce a brand new class of transmitter, and if RadioMaster continues refining the software program, it might grow to be a robust device for a really particular viewers.
