BETAFPV LiteRadio 4 Radio Transmitter
Version No.I 2025-03-18
1. Product profile
The LiteRadio 4 SE is a new radio transmitter from BETAFPV, equipped with ExpressLRS 2.4G protocol and the latest version of BETAFPV's LiteRadio operating system. It can control FPV drones equipped with ELRS 2.4G series receivers, and also supports a variety of mainstream FPV simulators including DJI Virtual Flight, meeting the needs of remote control uses from starter to advanced.
1.1 Feature highlights
- Utilizes BETAFPV's latest LiteRadio radio transmitter system.
- Added 2 new tact switches and upgraded the number of output channels to 10.
- Upgraded signal accuracy and service life of the controller sensor.
- New Bluetooth joystick mode for wireless connection to FPV simulators, compatible with computers, cell phones and tablets of various systems.
- New Xbox mode for practicing DJI Virtual Flight, compatible with computers, cell phones and tablets of various systems.
- Built-in 1S 2000mAh high-capacity Li-ion battery, can be used continuously for more than 8 hours.
- Maximum charging power upgraded to 15W, and the battery can be fully charged in 40 minutes at the shortest.
1.2 Specifications
- Model: LiteRadio 4 SE
- Operating Frequency: 2.4000-2.4835GHZ
- Bluetooth Transmit Power(EIRP): 2.4GHz< -0.25dBm
- WiFi Transmit Power(EIRP): 2.4GHz< 18.32dBm
- Operating Temperature: -10°C to 40°C.
- Charging Ambient Temperature: 0°C to 35°C
- Battery capacity: 2000mAh (Li-ion battery)
- USB charging input: 5V, supports up to 3A rapid charging
- Product weight: about 210g
- Product Size: 172.5mm*118.5mm*72.5mm
1.3 Default setting
- Radio transmitter mode: Mode2 (throttle is in the left hand i.e. )
- RF module configuration: Built-in RF module: ON, Built-in RF Module Wireless Protocol: ELRS3 2.4G
- ExpressLRS system configuration: Transmit power: 100mW, Packet rate: 250HZ, Telemetry rate: 1:8
Channel configuration
| Channel | CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | CH9 | CH10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Input | Roll(A) | Pitch(E) | Throttle(T) | Yaw(R) | SA | SB | SC | SD | SE | SF |
Other settings
- Buzzer tone switch: ON
- Joystick center dead zone: 1% (Joystick center dead zone does not act on the throttle channel)
2. Appearance
Front view
Diagram Description: An outline of the LiteRadio 4 Radio Transmitter showing the front view. Labeled components include: Joysticks (x2), Lanyard Loop, Status Indicator, Battery Indicator, and Power Button.
Top view
Diagram Description: An outline of the LiteRadio 4 Radio Transmitter showing the top view. Labeled components include: Toggle Switch SD, Toggle Switch SA, Button SF, Toggle Switch SC, and Toggle Switch SB Button SE.
Bottom view
Diagram Description: An outline of the LiteRadio 4 Radio Transmitter showing the bottom view. Labeled components include: Bind Button, Type-C Port, and SETUP Button.
Back view
Diagram Description: An outline of the LiteRadio 4 Radio Transmitter showing the back view.
3. Basic operation manual
3.1 Power on/off
- Short press and then long press the power button. Wait for the indicator lights to light up one by one and accompanied by the "beep beep beep" sound; the radio transmitter will be turned on.
- Short press and then long press the power button again. When the indicator lights turn off one by one and accompanied by "beep beep beep" sound, the radio transmitter will turn off the power.
- Short press the power button to display the current battery.
- A fully charged LiteRadio 4 SE radio transmitter can be used continuously for about 8 hours.
| Mode | LED Indicator | Buzzers | Description |
|---|---|---|---|
| Working | Blue light solid on | No | Working |
| Bluetooth | Purple light solid on | No | Bluetooth |
| Wi-Fi | Green light solid on | No | Wi-Fi |
| Throttle position warning | Red light solid on | No | The throttle joystick is not in the lowest position, please dial the throttle joystick to the lowest position. |
3.2 Charging
To ensure safety during storage and transportation, the lithium batteries are shipped with about 80% charge. When getting your new LiteRadio 4 SE radio transmitter, please fully charge the batteries before using it.
Diagram Description: The BETAFPV LiteRadio 4 SE transmitter is shown connected via a dual-ended Type-C cable to a 5V power adapter, indicated by a lightning bolt symbol ⚡.
- Turn off the radio transmitter.
- Use the USB cable to connect the radio transmitter to the 5V adapter.
- Disconnect the adapter as soon as possible after charging is complete.
- When using the 3A@5V rapid charge adapter, the LiteRadio 4 SE radio transmitter takes only about 40 minutes from low battery warning to full battery.
| Battery | Led Indicator | Buzzers | Description |
|---|---|---|---|
| Low Battery Warning | Orange light flashes four times and battery indicator will all off | With the sound of "beep beep beep" | Batteries are too low, need to charge the radio transmitter. |
| Charging | Red light flashing and battery indicator are lit one by one | No | Charging |
| Charging Complete | Green light flashing and battery indicator is solid on | No | Charging complete |
3.3 Frequency binding with receivers
Diagram Description: The BETAFPV LiteRadio 4 SE transmitter is shown alongside a drone, with a wireless signal icon ? connecting them, illustrating the binding process.
- Turn on the radio transmitter.
- Put the receiver into the binding state. The ELRS receivers usually power on and off in a quickly 3 times. For more details, please refer to the receiver's instruction manual.
- Long press the BIND button at the bottom of the radio transmitter to enter the binding state. This state lasts for up to 8 seconds.
- After the binding is successful, the remote control will emit a successful connection tone and automatically exit the binding state.
- If the binding is not successful within 8 seconds, please repeat the above operation.
- If you need to exit the binding state, please short press the BIND button.
- After the receiver is successfully bound, it will automatically connect the next time it is turned on, and there is no need to repeat the binding.
| Bind Status | Led Indicator | Buzzer | Description |
|---|---|---|---|
| Binding | Status indicator flashes red quickly 2 times | Accompanied by the sound of "beep beep" | Binding |
| Binding complete | No | Beep sound (One short and one long) | Binding complete |
| Disconnection warning | No | Beep sound (One long and one short) | The receiver connection is interrupted and needs to be reconnected/bind. |
3.4 Calibrating the joystick
Joystick calibration consists of two stages: the first stage is to calibrate the joystick center position, and the second stage is to calibrate the joystick boundaries.
Stage 1: Calibrating Center Position
- Turn on the radio transmitter.
- Long press the SETUP button on the bottom of the radio transmitter to enter the first stage of the joystick calibration state.
- Move all joysticks to the middle position.
Diagram Description: An outline of the LiteRadio 4 SE transmitter with blue arrows indicating the joysticks should be moved to the center position.
- Press the SETUP button briefly; the radio transmitter will record the center point of the joysticks and enter the second stage.
- Toggle the joysticks, gently touch the four boundaries: [up arrow], [down arrow], [left arrow], and [right arrow].
Diagram Description: An outline of the LiteRadio 4 SE transmitter with blue arrows indicating the joysticks should be moved to their extreme boundaries (up, down, left, right).
| Calibration | Led Indicator | Buzzer | Description |
|---|---|---|---|
| Calibration center | Red lights flash three times | Accompanied by the sound of "beep beep" | Enter the joystick calibration state and move all joysticks to the middle position to set the midpoint. |
| Calibration boundary | Red lights flash three times | Accompanied by the sound of "beep beep" | Gently move the joystick to the four boundaries of up, down, left, and right to set the maximum range of the joystick. |
| Calibration complete | Red lights flash three times | Beep sound (One short and one long) | Calibration complete. |
The joystick of the LiteRadio 4 SE radio transmitter is calibrated at the factory and needs to be re-calibrated only if the remote control is subjected to violent impacts, or if you notice a significant shift in the joysticks signal after prolonged use.
4. Connecting to a Simulator
The LiteRadio 4 SE radio transmitter can be connected to computers, phones, and tablets for practicing FPV simulator or DJI Virtual Flight.
4.1 Solution 1: Bluetooth joystick mode
The Bluetooth joystick mode is compatible with Windows and macOS computers, as well as Android phones and tablets, and supports all major FPV simulators except DJI Virtual Flight.
Diagram Description: The LiteRadio 4 SE transmitter is shown connected wirelessly via Bluetooth ? to a computer and mobile devices.
- While pressing the BIND button, short press and then long press the power button to turn on the device and enter the Bluetooth working mode.
- Turn on the Bluetooth function of your computer, cell phone, or tablet to search for a new Bluetooth device.
- Select the device with the name "BETAFPV Joystick" to complete the connection.
4.2 Solution 2: Data cable joystick mode
The joystick mode with data cable connection is compatible with Windows and macOS computers and supports all major FPV simulators except DJI Virtual Flight.
Diagram Description: The LiteRadio 4 SE transmitter is shown connected via a dual-ended Type-C cable to a laptop labeled "FPV Simulator".
- Turn off the radio transmitter.
- Use a USB data cable to connect the radio transmitter and computer.
- At this time, the LiteRadio 4 SE radio transmitter can be identified as a "BETAFPV Joystick".
Note: In the power-on state, there is no signal output from the USB of the remote control radio transmitter, and the joystick mode can't be used.
4.3 Solution 3: Data cable Xbox mode
Xbox mode can only be connected by data cable and can be used to practice DJI Virtual Flight or other FPV simulators that support Xbox mode, which is compatible with Windows and macOS computers, as well as Android phones and tablets.
Diagram Description: The LiteRadio 4 SE transmitter is shown connected via a dual-ended Type-C cable to a computer/mobile device displaying "DJI Virtual Flight".
- Turn off the radio transmitter.
- At the same time, turn the left joystick to the lower right corner and the right joystick to the lower left corner. Use the USB cable to connect the radio transmitter to the computer, cell phone, or tablet. The status indicator will flash white lights 3 times, indicating that it has successfully entered the Xbox mode.
- At this time, the LiteRadio 4 SE radio transmitter can be recognized as "BETAFPV Joystick".
Note: There is no signal output from the USB of the remote control in the power-on state, and Xbox mode cannot be used.
Note: After connecting to Xbox mode under Windows system, if you find that the cursor moves, please move the joystick and three-position switch of the remote control to the middle position, and move the two-position switch to the left and right.
DJI Virtual Flight default button functions
Windows operating system
Diagram Description: The LiteRadio 4 SE transmitter is shown with labels indicating button functions for Windows OS in DJI Virtual Flight. Functions include: Upward dialing: Lens angle adjustment, Upward dialing: S/N/W mode switching, Switching to the center is completed, Preset Function, Start and stop, Downward dialing: Lens angle adjustment, Downward dialing: Viewpoint switching, Braking in S/N mode.
Android operating system
Diagram Description: The LiteRadio 4 SE transmitter is shown with labels indicating button functions for Android OS in DJI Virtual Flight. Functions include: Preset Function, Lens angle adjustment, S/N/W mode switching, Start and stop, View, Restart.
5. Configure radio transmitter
BETAFPV Configurator is a ground station application independently developed by BETAFPV. It can configure specifications or upgrade firmware for LiteRadio series radio transmitters. It is compatible with computers running Windows, Linux, and macOS.
Download: https://github.com/BETAFPV/BETAFPV_Configurator/releases
5.1 Connecting BETAFPV configurator
- Turn off the radio transmitter.
- Connect the radio transmitter and computer by the USB cable.
- Open the BETAFPV Configurator application and switch to the radio transmitter configuration program.
- Click the "connect radio transmitter" button on the upper right corner of the interface to enter the setup interface.
Note: In the power-on state, there is no signal output from the USB of the remote control, so you can't use BETAFPV Configurator. Please do remember turn off the radio transmitter.
5.2 Upgrading the radio transmitter firmware
- Turn off the radio transmitter and disconnect the USB connection.
- Press and hold the power button while holding down the SETUP button. The status indicator will light up in blue light with "beep beep" sound, and enter the radio transmitter firmware flash mode.
- Use the USB cable to connect the radio transmitter and computer.
- Open the BETAFPV Configurator application and switch to the radio transmitter configuration program.
- Click the "Firmware Flasher" button on the upper left of the interface to enter the firmware flash interface.
- Follow the "Steps of How to flasher" at the bottom of the firmware programming interface to complete the programming.
Note: When the radio transmitter is turned on, there is no signal output from the USB port, so it is impossible to upgrade the firmware of the radio transmitter. Please do remember turn off the radio transmitter.
It is recommended to visit the support page on the official website for detailed tutorials on using the BETAFPV Configurator or to download the latest version of the firmware.
Support page link: https://support.betafpv.com/hc/en-us/articles/40274282610329-Manual-for-LiteRadio-4
6. Compliance Information
Model: LiteRadio 4 SE
FCC ID: 2AT6X-LITERADIO4SE
6.1 FCC statements
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.
NOTE: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications or changes to this equipment. Such modifications or changes could void the user's authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Radiation Exposure Statement
The device has been tested and comply with FCC SAR limits.
6.2 EU Declaration of Conformity
Hereby, Shenzhen Baida Moxing Co., Ltd. declares that the radio equipment type LiteRadio 4 SE is in compliance with directive 2014/53/EU.
CE
The full text of the EU declaration of conformity is available at the following internet address: https://support.betafpv.com/hc/en-us
Specific Absorption Rate (SAR)
- Your device is tested to comply with applicable requirements and regulations of the European Union of human exposure to radio wave.
- Specific Absorption Rate (SAR) is used to measure radio waves absorbed by human. The device complies with RF specifications when the device is used at a distance of 0mm from your limbs. The SAR limit is 4.0 W/kg averaged over 10 gram of tissue in the European Union.
- LiteRadio 4 SE was tested and recorded the maximum SAR value was 1.78W/kg for the limbs.
CAUTION RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
7. Disclaimer
Before using this product, please read and comply with the operating guidelines in this manual carefully. If the product malfunctions or becomes unusable due to irregular operation, BETAFPV may not be able to provide you with the corresponding warranty measures and other after-sales services.
By using this product, you are deemed to have read and accepted all the terms and conditions associated with this product.
The wireless operating frequency bands and their corresponding available ranges vary from country to country, please refer to the local laws and regulations for details.
The documentation for this product is subject to change without notice, please visit www.betafpv.com for the latest information.
