RadioMaster GX12 Dual-Band Gemini-X ExpressLRS Radio Controller M2 User Manual

Introduction

The RadioMaster GX12 is a state-of-the-art radio controller designed for advanced remote control applications, featuring ExpressLRS Gemini-XROSSBAND (GEM-X) technology. This manual provides essential information for the safe and effective operation, setup, and maintenance of your GX12 radio controller.

Image: Front view of the RadioMaster GX12 radio controller, showcasing its dual antennas, central display, gimbals, and various control switches and buttons.

Image: A promotional graphic for the GX12, emphasizing its advanced features such as dual 1W RF output, dual-band antenna, Gemini Xrossband technology, and high-precision gimbals.

Safety Information

Please read the user instructions carefully before operating the device.

• Always ensure the radio controller is fully charged before use.
• Operate the device in a safe environment, away from obstacles and other radio interference sources.
• Do not expose the device to extreme temperatures, moisture, or direct sunlight.
• Keep out of reach of children.
• Only use approved batteries and charging methods.

What's in the Box

Upon opening the package, verify that all components listed below are present:

• GX12 Radio Controller
• Carry Case
• Battery Tray (Battery Cells Not Included)
• Replacement Switch Panels
• Type-C Cable
• Accessories
• User Instructions (Quick Start Guide)

Image: All items included in the GX12 Radio Controller package, neatly laid out, showing the controller, its grey carry case, battery tray, USB-C cable, and other small accessories.

Setup

1. Battery Installation

The GX12 Radio Controller requires a 7.4V 2-cell Lithium-Polymer battery, two 3.7V 18650 Lithium-Ion cells, or a 21700 5000mAh battery (batteries not included). Locate the battery compartment on the back of the controller.

Image: Rear view of the GX12 radio controller, highlighting the battery compartment cover with a "PUSH" indicator and the RadioMaster strap.

1. Open the battery compartment cover.
2. Insert the compatible battery into the tray, ensuring correct polarity.
3. Close the battery compartment cover securely.

2. Charging

The GX12 supports 2S Smart Balance Charging via its USB-C port.

• Connect the supplied Type-C cable to the USB-C port on the controller and to a suitable USB power source.
• The OLED display will indicate charging status.

3. Antenna Setup

The GX12 features dual folding 2.4GHz/Sub-G 900MHz omnidirectional antennas.

• For optimal performance, unfold the antennas to an upright position before operation.
• Fold them down for compact storage and transport.

Image: Front view of the GX12 radio controller with its dual antennas folded down, demonstrating its compact form factor for storage.

4. Gimbal Sticks

The GX01 gimbals feature folding sticks for easy transport.

• To fold, gently push the stick downwards and then fold it into the gimbal housing.
• To unfold, pull the stick out until it locks into the upright position.

Image: An exploded view diagram showing how the gimbal sticks on the GX12 can be folded for transport, highlighting the mechanism for compact storage.

Operating Instructions

1. Powering On/Off

• To power on, press and hold the power button until the OLED display illuminates.
• To power off, press and hold the power button until the display shuts down.

2. Controls Overview

The GX12 features a comprehensive set of controls for precise operation:

Image: Side profile of the GX12 radio controller, illustrating its ergonomic design and the placement of additional switches and controls on the side.

• GX01 1000Hz, 3D Digital CNC Hall Effect Gimbals: Provide precise control inputs.
• Switches (SA, SD, T1-T6): Configurable for various functions.
• Buttons (SYS, RTN, PAGE, TELE): For navigating the EdgeTX firmware menu.
• Pots (P1, P2): Rotary potentiometers for fine adjustments.
• 128*64 Monochrome OLED Display: Shows telemetry data, menu options, and settings.

Image: A detailed cutaway view of the GX01 Digital 1000Hz 12-bit Gimbal, highlighting its CNC aluminum construction, quad ball bearings, and 3D Digital Hall Effect Sensors for exceptional precision.

3. ExpressLRS Gemini-XROSSBAND (GEM-X)

The GX12 is the first radio to feature ExpressLRS Gemini-XROSSBAND (GEM-X), allowing for simultaneous transmission on both 2.4GHz and 915MHz. This ensures unmatched interference rejection and extended range.

• The internal RF module supports ELRS 2.4GHz / Sub-G 900MHz.
• It is compatible with all current 2.4GHz and 900MHz ExpressLRS receivers, as well as the new generation of Gemini Xrossband (Gem-X) receivers.

4. EdgeTX Firmware

The radio operates on EdgeTX firmware, providing a highly customizable and powerful user interface. Refer to the official EdgeTX documentation for detailed instructions on model setup, binding, and advanced configurations.

• Channels: Max 16 channels (Receiver dependent).
• Upgrade Method: USB / EdgeTX Companion PC software.

Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the radio. Avoid using harsh chemicals or abrasive materials.
• Cooling Fan: The GX12 includes a cooling fan to manage heat during operation. Ensure the fan vents are clear of obstructions.
• Storage: When not in use, store the radio controller in its carry case in a cool, dry place, away from direct sunlight and extreme temperatures.
• Gimbal Care: The GX01 gimbals are precision components. Avoid applying excessive force or exposing them to dust and debris.

Troubleshooting

• Radio Not Powering On:
  • Check battery charge level.
  • Ensure battery is correctly installed with proper polarity.
• No Signal/Binding Issues:
  • Verify that the receiver is compatible with ExpressLRS.
  • Ensure both radio and receiver are in binding mode.
  • Check antenna orientation on both devices.
• Display Not Working:
  • Ensure the radio is powered on.
  • If the issue persists, contact support.
• Firmware Update Issues:
  • Ensure the USB cable is securely connected.
  • Use the official EdgeTX Companion PC software for updates.
  • Refer to EdgeTX documentation for detailed update procedures.

Specifications

Image: A comprehensive table detailing the specifications of the GX12 Radio, including dimensions, weight, frequency, internal RF, battery, and display type.