BETAFPV Nano TX V2 Module User Manual

Introduction to ExpressLRS

ExpressLRS is a new generation of open-source wireless remote control system dedicated to providing the best wireless link for FPV Racing. It is based on the fantastic Semtech SX127x/SX1280 LoRa hardware combined with an Espressif or STM32 Processor, offering characteristics such as long remote control distance, stable connection, low latency, high refresh rate, and flexible configuration.

The BETAFPV Nano TX V2 module is a high-performance wireless remote control product based on ExpressLRS V3.3, featuring strong anti-interference performance and a stable signal link. It includes the custom button and Backpack function from the previous Nano RF module, improves its RF transmission power to 1W/2W, and redesigns the heat dissipation structure. These updates provide simpler operation, better performance, and suitability for applications like racing, long-range flights, and aerial photography, which require high signal stability and low latency.

Github Project Link: https://github.com/ExpressLRS

Specifications

2.4GHz Version (Model: ExpressLRS 2.4G)

• Packet Rate: 50Hz/100Hz/150Hz/250Hz/333Hz/500Hz/D250/D500/F500/F1000
• RF output Power: 25mW/50mW/100mW/250mW/500mW/1000mW
• Frequency Band: 2.4GHz ISM
• Power Consumption: 8V, 1A@1000mW, 150Hz, 1:128
• Antenna Port: RP-SMA

915MHz&868MHz Version

• Packet Rate: 25Hz/50Hz/100Hz/100Hz Full/200Hz/D50
• RF output Power: 10mW/25mW/50mW/100mW/250mW/500mW/1000mW/2000mW
• Frequency Band: 915MHz FCC/868MHz EU
• Power Consumption: 8V, 1A@1000mW, 50Hz, 1:128
• Antenna Port: SMA
• Input Voltage: 7V~13V
• USB Port: Type-C
• USB Power Supply Range: 7-13V (2-3S)
• Built-in Fan Voltage: 5V

Hardware Overview

The module features an SMA/RP-SMA Port, Cooling Fan, State Indicator Light, Button2, Button1, and a USB Type-C Interface.

Note: Please assemble the antenna before powering on. Otherwise, the PA chip will be damaged permanently.

The BETAFPV Nano TX V2 Module is compatible with radio transmitters that have a nano module bay (e.g., BETAFPV LiteRadio 3 Pro, Radiomaster Zorro/Pocket, Jumper T Pro V2/T20, TBS Tango 2).

Indicator Status

The receiver indicator status includes:

The packet rate corresponds to the RGB indicator color as shown below:

2.4GHz:

[Color spectrum showing packet rates from F1000 to 50Hz]

915MHz/868MHz:

[Color spectrum showing packet rates from D50 to 25Hz]

Packet Rate Modes:

• FLRC Mode (F1000, F500): Supported by ELRS 2.4G. Features lower latency and faster configuration, but with shorter remote control distance. Suitable for racing.
• DVDA Mode (D500, D250): Works under F1000 rate of FLRC mode. Repeats identical packets in complex environments for safer radio link connection. D500 sends packets twice, D250 sends four times.
• D50 Mode: Exclusive to ELRS Team900. Sends packets four times repeatedly under 200Hz Lora Mode, with a remote control distance equivalent to 200Hz.
• 100Hz Full Mode: Achieves 16-channel full resolution output at 200Hz packet rates of Lora mode, with a remote control distance equivalent to 200Hz.

Transmitter Configuration

The Nano TX V2 module defaults to the Crossfire serial data protocol (CRSF). The remote control's TX module interface must support CRSF signal output. The following describes configuration using the EdgeTX remote control system as an example.

CRSF Protocol Configuration

In the EdgeTX system: Select "MODEL SEL" and enter the "SETUP" interface. Turn off Internal RF (set to "OFF"), turn on External RF, and set the output mode to CRSF. Connect the module correctly for proper function.

Example Setup Screen:

Lua Script Usage

Lua is a lightweight and compact script language that can be embedded in radio transmitters for easy reading and modification of module parameters. Follow these steps:

• Download the elrsV3.lua file from the BETAFPV official website or ExpressLRS configurator.
• Save the elrsV3.lua file to the radio transmitter's SD Card in the Scripts/Tools folder.
• Press the "SYS" or "Menu" button on the EdgeTX system to access the "Tools" interface, select "ExpressLRS", and run it.

Lua Script Interface Example:

BFPV Nano TX V2 0/1000 C

Packet Rate F1000(-104dbm)

Telem Ratio Std(1:64)

Switch Mode Wide

Model Match Off(ID: 0)

> TX Power(100mW)

> VTX Administrator

> WiFi Connectivity

> Backpack

[BLE Joystick]

[Bind]

3.3.1 ISM2G4 b08b82

> Other Device

The Lua script allows configuration of parameters like Packet Rate, Telem Ratio, and TX Power. Refer to the technical support page for detailed function introductions.

More Information: Learn more details of ExpressLRS Lua at https://www.expresslrs.org/quick-start/transmitters/lua-howto/.

Custom Button

The module has two customizable buttons. Follow these steps to configure their functions:

1. Enter WiFi mode by enabling the module or powering it on for 60 seconds. The RGB state indicator will show a slow green flash, activating the receiver's WiFi (Name: ExpressLRS TX, Password: expresslrs).
2. Connect your phone or computer to this WiFi and access http://10.0.0.1 in a browser to find the custom button settings page.
3. In the "Action" column, select the desired custom function. In the "Press" and "Count" columns, specify the button press type (long or short) and the number of presses or duration.
4. Click "Save" to complete the configuration.

Buttons can be set for long press (custom duration) or short press (custom number of presses). Six settable functions are available:

• Unused
• Increase Power Output
• Go to VTX Channel Menu
• Go to VTX Frequency Menu
• Send VTX Settings
• Enable WiFi
• Enter Binding Mode

Default Button Functions:

Bind

The default firmware for the Nano TX V2 module is ExpressLRS version 3.3.0, without a pre-set Binding Phrase. Binding requires the receiver to be using V3.0.0 or above without a binding phrase.

1. Put the receiver into binding mode and wait for connection.
2. Quick press Button 1 (Left button) three times to enter binding mode (factory default). Alternatively, click 'Bind' in the Lua script. A solid indicator light signifies successful binding.

[Illustration showing a finger pressing Button 1 three times]

Note: If the transmitter module has been reflashed with a binding phrase, the above method will not bind to other devices. Set the same binding phrase for the receiver for automatic binding.

External Power

The Nano TX V2 module's power consumption is high at 500mW or above, which can shorten the remote control's usage time. Users can connect an external battery using an XT30-USB adapter cable for power.

[Diagram showing XT30 connector, 2-3S battery, and connection to the module]

Note: If the remote control battery or external battery voltage is lower than 7V (2S) or 10.5V (3S), do not use 500mW or 1W power. This can cause the module to reboot due to insufficient power, leading to disconnection and loss of control.

Q&A

[Q1] Unable to enter LUA script.

Possible reasons:

1. The TX module is not well connected to the remote control. Check the Nano pin and TX module socket contact.
2. The ELRS LUA script version is too low and needs to be upgraded to elrsV3.lua.
3. The remote control's baud rate is too low. Set it to 400K or above. If the option is unavailable, upgrade the remote control firmware (e.g., EdgeTX V2.8.0 or above).

[Q2] Packet Rate cannot be set to F1000 or prompt "Baud rate is too low".

Reason: The remote control's baud rate is too low. F1000 packet rate requires a baud rate of 400K or higher.

Solution: Update the baud rate setting (greater than 400K) in the Model Setup menu or System menu -> Hardware, and reboot the remote control to apply the setting.

[Q3] Packets between remote control and TX module are less than 1000, while F1000 packet rate is turned on.

Reason: Synchronization issues with the remote control system (e.g., EdgeTX).

Solution: Upgrade the EdgeTX version of the remote control to 2.8.0 or above.

More Information

As the ExpressLRS project is frequently updated, please check BETAFPV Support (Technical Support -> ExpressLRS Radio Link) for the latest details and manuals.

https://support.betafpv.com/hc/en-us

• Newest user manual
• How to upgrade the firmware
• FAQ and troubleshooting

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.

The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.