Radiomaster GX12 Radio Controller User Manual

1. Introduction

Thank you for choosing the RadioMaster GX12, a versatile remote control system featuring dual-band capabilities with 2.4GHz, Sub-G, and Gemini-Xrossband technology. Whether you're a beginner or a seasoned professional, the GX12 is designed to meet your needs, offering precision, flexibility, and reliability.

This guide provides essential information for safe and optimal use of your new remote control. We continuously enhance our software and hardware, and updated versions of this manual may be released. For the latest information and resources, please visit our website.

The GX12 remote control device is suitable for all types of model products and any other equipment you may build, as long as it can be assembled, the GX12 will be able to control it. Powered by the robust EdgeTX platform, the GX12 is equipped for seamless integration with your projects.

For more detailed guides, firmware updates, and additional resources, please refer to the official RadioMaster website.

Disclaimer: RadioMaster does not assume any responsibility for any adverse consequences caused by the use or misuse of this product.

2. Safety Information

Many remote-control models are equipped with powerful motors and sharp propellers. When using or maintaining models, proceed with caution. When performing assembly or maintenance, make sure to disconnect the power to the model and remove the propellers.

Important Safety Precautions:

• Before installing the battery and turning on the remote control, ensure the provided antenna is securely installed on top of the remote control. Operating the internal RF module without an antenna installed can damage the module and void the warranty.
• Do not operate the GX12 remote control system under the following conditions:
• In severe weather or strong windy conditions, such as rain, hail, snow, storms, or electromagnetic environments.
• In any situation where visibility is limited.
• In areas where people, property, high-voltage power lines, public roads, vehicles, or animals may be present.
• If you feel tired or unwell, or are under the influence of drugs or alcohol.
• If the remote control or model appears damaged or is not functioning properly.
• In areas with high 2.4GHz or Sub-G interference, or where these radio frequencies are prohibited.
• When the radio's battery voltage is too low for operation.
• In areas where local regulations prohibit the use of R/C aircraft.

3. Package Contents

The GX12 Radio Controller package includes the following items:

Image: All components included in the Radiomaster GX12 package.

• 1 * GX12 Radio Controller
• 1 * Signature Carry Case
• 1 * 18650 Battery Tray
• 2 * Replacement Switch Panels
• 1 * Type-C Cable
• 1 * Screen Protector
• 1 * 1.5mm Hex Wrench
• 4 * Low Tension Gimbals Springs
• 6 * Switch Delete Plugs
• 1 * 2 Position Switch
• 1 * Momentary Switch
• 1 * RadioMaster Sticker Set
• 1 * GX12 Manual

4. Product Overview

The Radiomaster GX12 is a high-performance radio controller designed for precision and reliability. Below are key features and a diagram of its components.

Image: Front view of the Radiomaster GX12 radio controller.

4.1. Component Diagram

Image: Quick Start Guide diagram labeling the GX12's buttons, switches, gimbals, and ports.

Key components include:

• Antenna: Dual folding 2.4GHz/Sub-G omni directional antennas.
• Gimbals: GX01 1000Hz, 3D Digital CNC Hall Effect Gimbals with folding sticks.
• Display: 128*64 Monochrome OLED Display.
• Switches: SB 3-Position, SE 3-Position, SG Button, SA Button, SC 3-Position, SF 3-Position, SH Button, SD Button.
• Sliders: S1 Slider, S2 Slider.
• Buttons: SYS, RTN, PAGE>, PAGE<, TELE, MDL, Power Button, 6 Position Buttons.
• Dials: P1 Dial, P2 Dial, Scroll Wheel.
• Ports: USB-C Data & Charging Port, DSC Trainer Port, Headphone, DIY SMA Ports, External Nano Bay.
• Other: Modular Switch Panels, Removable Grips, Battery Bay, Lanyard Loop.

4.2. Dimensions

Image: Front and side dimensions of the GX12 radio controller (183mm x 148mm x 78mm).

4.3. Advanced Features

• Dual-Band Dual 1W Gemini Xrossband ExpressLRS Transmitters: Experience unmatched range and reliability with ExpressLRS Gemini Xrossband (Gem-X) dual-band transmission capabilities (2.4GHz and 915MHz).
• Integrated Folding Dual-Band Antennas: Sleek design with foldable antennas for easy transport and storage, compatible with both 2.4GHz and Sub-G 900MHz frequencies.
• GX01 Gimbals - Fully CNC Aluminum 3D Digital Hall Sensor Gimbals: Precision-engineered aluminum gimbals with 3D Hall sensors for superior control and durability.
• 1000Hz Digital Gimbals with EdgeTX Sync: Achieve exceptional precision and responsiveness with high-frequency digital gimbals featuring EdgeTX sync.
• Removable Switch Panels: Customize your setup with modular switch panels, allowing for easy switch changes.
• DIY SMA Ports: Enjoy flexibility in antenna installation with SMA port integration.
• OLED Display: Crisp and clear OLED with high contrast display.
• Internal Storage: 512MB of integrated high-speed flash storage—no need for TF cards!
• USB-C Connectivity: A single USB-C port manages smart balance charging, SIM connectivity, firmware updates, and direct access to the integrated high-speed flash memory.
• Programmable RGB Indicators: Customizable RGB lights provide visual feedback on switch status for 6-Position and SA/SD Switches.
• Powerful Efficient Cooling System: With dual 1-watt transmitters, the GX12 features an advanced cooling system to maintain optimal performance.
• PCB Nano Coating: Engineered for extreme conditions with thicker plastics and a hydrophobic PCB coating to withstand hot, cold, dry, and humid environments.

Image: Detailed view of the GX01 Digital 1000Hz 12-bit Gimbal with CNC aluminum construction.

Image: Illustration of the GX12's dual-band (2.4GHz and 900MHz) foldable antennas.

Image: The GX12 with folding gimbal sticks for easy transport in a backpack.

Image: Overview of GX12 features including OLED screen, modular switches, and internal memory.

Image: Semtech LR1121 RF Transceivers enabling 2.4GHz, 900MHz, and Gemini-X functionality.

Image: Engineering for extreme conditions, highlighting hydrophobic PCB coating, extra rigid plastics, and advanced cooling system.

Image: Single USB-C interface for charging, data transmission, and simulator use.

5. Setup

5.1. Antenna Installation

Before powering on the GX12, ensure the provided dual-band antennas are securely screwed into the SMA ports on the top of the controller. Operating the internal RF module without antennas can cause damage and void the warranty.

5.2. Battery Installation and Charging

The GX12 features a built-in USB-C smart balance charging function designed for 3.7V lithium batteries. The charging circuit is designed to charge either two 3.7V Li-ion 18650 batteries or a 2S 7.4V Li-Poly battery pack. The nominal battery voltage is 3.7V, and the charged voltage is 4.2V/Cell.

Image: Smart Active Balance Charging system prevents overcharging and extends battery life.

CAUTION:

• DO NOT use LiFE battery packs or 18650 lithium-ion batteries with a nominal voltage of 3.6V with a fully charged voltage of 4.1V. Charging the incorrect type of battery may damage the charger or cause a fire.
• If using Li-ion batteries, ensure the cells are unprotected and are button-top cells.
• Always check the voltage and condition of the battery regularly.
• Never charge unattended. Always charge in a safe area away from combustible materials.
• Do not charge if the remote control gets wet or is damaged.
• DO NOT charge with the polarity reversed.

5.3. Firmware

The GX12 comes pre-installed with factory-approved EdgeTX firmware. For the latest software and manual updates, please visit the RadioMaster website: www.radiomasterrc.com.

Further firmware information can be found at:

• EdgeTX: www.edgetx.org
• ExpressLRS: www.expresslrs.org
• Multi Protocol Module: www.multi-module.org

6. Operation

6.1. Model and Protocol Selection

The GX12 is equipped with a built-in dual-band, dual-frequency ExpressLRS RF module, offering compatibility with a wide range of receivers:

• 2.4GHz receivers
• Sub-GHz receivers
• Gemini-Xross dual-band receivers

Image: Compatibility chart for ExpressLRS receivers including RP, ER, BR, DBR4 series, and Gemini Xrossband.

Packet Rate Selection:

To select the appropriate Packet Rate on your GX12 remote control, follow these options based on the receiver type:

• 50Hz-500Hz 2.4G: For binding with any ELRS 2.4GHz receiver.
• 50Hz-200Hz Low Band: This is for binding with any ELRS Sub-GHz receiver.
• X100 and X150: For use with Gemini Xross dual-band receivers.
• DK250/DK500/K1000: These are new FSK high-speed modes for LR1121-based receivers.

For a detailed receiver compatibility chart, visit the RadioMaster manuals page.

6.2. Binding Instructions

1. TURN OFF the transmitter.
2. Cycle power to the receiver 3 times; the receiver LED will flash twice, indicating bind mode.
3. TURN ON the transmitter, long press the SYS button, and choose ExpressLRS LUA under the TOOLS menu.
4. Scroll to [Bind] and press enter.
5. The LED on the receiver should now be solid, indicating a successful bind.

6.3. Gimbal Calibration and Adjustment

The gimbals are factory calibrated. It is ONLY necessary to re-calibrate the gimbals using the Calibration App if the gimbals have been removed from the radio for service.

Gimbal adjustments can be made as follows (refer to the diagram in Section 4.1 for visual reference):

• L-R Mode-1, 2 (Self-Centering): CW to disable self-centering, CCW to enable.
• Vertical Tension (Up-Down): CW to increase tension, CCW to decrease.
• Up-Down Stick Travel (38-60 degrees): CW to decrease travel, CCW to increase.
• Horizontal Tension (Left-Right): CW to increase tension, CCW to decrease.
• Throttle Stick Tension: CW to increase tension, CCW to decrease.

7. Maintenance

7.1. Battery Care

• Regularly check the voltage and condition of your batteries.
• Always charge batteries in a safe area, away from combustible materials, and never leave them unattended during charging.
• Do not charge the remote control if it has been exposed to moisture or sustained damage.

7.2. General Care

The GX12 is designed with durable materials and a hydrophobic PCB coating for resilience in various environments. To ensure longevity, keep the controller clean and free from dust and debris. Avoid exposing it to extreme temperatures or direct sunlight for prolonged periods.

8. Troubleshooting

• Controller or Model Not Functioning: If the remote control or your model appears damaged or is not working correctly, cease operation immediately.
• Firmware Issues: Incorrect firmware updates can render the remote control inoperable. If you are unsure about the update process, seek assistance from official resources.
• Hardware Problems: For any hardware-related issues, retain your proof of purchase and contact the retailer where you purchased the GX12.

9. Specifications

10. User Tips

• Gimbal Tension: The gimbals are adjustable. If you find the stick tension too soft or too stiff, refer to the gimbal adjustment instructions in Section 6.3 to customize them to your preference.
• 6-Position Switch Configuration: When configuring the 6-position switch, ensure you select "GR1", "GR2", etc., in the settings. For individual button functionality, choose "SW1", "SW2", etc., in the channel settings. Buttons can also be combined for more complex functions.
• Product Authenticity: The Radiomaster GX12 is an original product.

11. Warranty and Support

If you encounter any problems with your remote control hardware, please retain your proof of purchase and contact the retailer where you purchased the GX12. You may also visit the official RadioMaster warranty support page for assistance: www.radiomasterrc.com/contact.

12. Compliance Information

Image: Back of the GX12 product box showing compliance markings and manufacturer details.

12.1. EU Simple Declaration of Conformity

RadioMaster declares that the radio equipment GX12 is in compliance with EU directives Directive 2014/53/EU.

Manufacturer: ShenZhen RadioMaster Co., Ltd, 3th Floor, Yangtian Building, No. 18 Yangtian Road, Xin'an Street, Baoan District, Shenzhen, Guangdong, Mainland China.

12.2. FCC Information

FCC ID: 2BBP3-GX12

This equipment has been tested and found to comply with the limits for Part 15 of the FCC rules. This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

The full text of the declaration of conformity is available at: www.radiomasterrc.com.

12.3. Antenna Separation Distance

When operating your RadioMaster transmitter, please ensure a separation distance of at least 20 cm between your body (excluding fingers, hands, wrists, ankles, and feet) and the antenna. This is to meet RF exposure safety requirements as determined by FCC regulations.

13. Additional Resources

A user manual in PDF format is available for download. You can view it here: Radiomaster GX12 User Manual (PDF).