BETAFPV SuperG Nano Transmitter Module (ELRS 2.4GHz) Gemini Dual-Frequency Diversity, Dual 1W, RP-SMA

Overview

BETAFPV SuperG Nano Transmitter is an ELRS 2.4GHz transmitter module based on ExpressLRS V3.3.0, developed in collaboration with the ELRS developer team. It features Gemini dual-frequency diversity (dual-active antennas @ dual frequencies) and can be activated to achieve strong link quality when used with true diversity receivers such as SuperD receiver or SuperP receiver. With dual 1W output power, it is designed for stable control in complex radio environments for FPV racing, long-range flight, and professional photography.

Key Features

• First ever Gemini dual-frequency diversity transmitter module (Gemini mode: dual RF link; designed for stable link quality in complex radio environments).
• Dual 1W RF power and F1000 packet rate support (packet rates listed in Specifications).
• ExpressLRS: ELRS V3.3 / 2.4GHz ISM band.
• Dual SX128x RF chips.
• CNC aluminum alloy casing; 3 colors available (Black, Red, Grey).
• Cooling system: high-speed axial fan and pure copper heatsink (fan voltage: 5V).
• 2 customizable buttons (Button1, Button2) and USB Type-C interface.
• External power supply supported (7V–13V DC).
• Backpack support.
• CRSF-based operation; designed for radios that support CRSF output and can be configured via Lua script (EdgeTX/OpenTX mentioned in documentation).
• Compatibility note: LiteRadio 3 Pro radio transmitter cannot support dual transmitter power above 100mW due to power supply issues.

Specifications

For pre-sales and after-sales support, contact support@rcdrone.top or visit https://rcdrone.top/.

Diversity & Gemini Modes

• Antenna Diversity mode: two antennas; switches antennas to read RSSI and determine which antenna to use to receive data.
• True Diversity mode: both antennas receive data at the same frequency; the antenna that receives the correct data first is used.
• Gemini mode: two antennas receive telemetry data simultaneously with a frequency difference of 40MHz, and also transmit simultaneously at different frequencies. This allows receiving the same data packets on different frequencies and antennas for stable operation in complex radio environments.

Mode comparison chart content (RX/TX behavior):

• Basic: RX single antenna; TX single packet; transmit frequency same frequency; signal immunity: 2/5 stars.
• Antenna Diversity: RX two antenna (one active); TX single packet; transmit frequency same frequency; signal immunity: 3/5 stars.
• True Diversity: RX two antenna (two active, @same frequency); TX single packet; transmit frequency same frequency; signal immunity: 4/5 stars.
• Gemini: RX two antenna (two active, @dual frequencies); TX double packets (dual frequencies); transmit frequency dual frequency, 40MHz apart; signal immunity: 5/5 stars.

Compatibility & Configuration Notes

• Compatibility note from image: support TX using EdgeTX V2.8.0 and OpenTX V2.3.15 (as referenced).
• Basic configuration (EdgeTX example): disable Internal RF (OFF), enable External RF, and set Output Mode to CRSF.
• Lua script setup: copy the official Lua script elrsV3.lua to the SD card under Scripts/Tools, then run it from the SD-HC card menu.

Custom Buttons

The transmitter reserves 2 buttons that can be customized. WiFi/custom button setup steps (as described):

1. Enable WiFi via Lua or power on and wait for 60 seconds to enter WiFi mode.
2. RGB indicator light slowly flashes green, indicating WiFi is enabled (WiFi name: ExpressLRS TX; WiFi password: expresslrs).
3. Connect to the WiFi network and open a browser to http://10.0.0.1 to access custom button settings.
4. Select the desired function in the Action column, then set button type and press count/duration, and save.

6 functions that can be assigned:

• Unused
• VTX Setting
• Increase Output Power
• Enable WiFi
• Enter VTX Channel
• Enter Binding Mode
• Enter VTX Band

Factory default button behavior (from table):

Note: This transmitter hardware does not support button RGB lights.

Bind & External Power Supply

• Default firmware uses ExpressLRS V3.3.0 official protocol without a Binding Phrase. The receiver should use firmware V3.0.0 or higher and have no Binding Phrase set.
• Binding steps: put the receiver in a bound state and wait; click “Bind” in the Lua script or use the configured custom button to enter binding mode; solid indicator shows bound successfully.
• Note: If TX firmware is reflashed and a Binding Phrase is configured, this binding method will not enter binding state. Set RX to the same Binding Phrase for automatic connection.

Power notes (as described):

• When dual transmit power exceeds 500mW, power consumption increases; using an external battery is recommended to extend usage time.
• Power consumption depends on transmit power and telemetry ratio. At 500mW and above, a higher return ratio can reduce power consumption.
• Example (Gemini mode): return ratio 1:128 consumes 1000mA; return ratio 1:2 consumes about half of 1:128.
• Note: When the radio transmitter battery or external battery voltage is lower than 7V (2S) or 10.5V (3S), use Gemini mode at 500mW and 1W carefully to avoid restart due to insufficient power supply, which may cause link disconnection.

Important note: Assemble the antenna before powering on. Otherwise, the PA chip in the SuperG Nano Transmitter may be permanently damaged.

Binding tip from image: “Quick press the key for three times to enter the binding mode.”

FAQ

• Cannot enter Lua script when establishing a link:
  • Lua script version is outdated; upgrade to elrsV3.lua.
  • Radio transmitter baud rate is below 400K; adjust to above 400K.
  • If baud rate cannot be modified, update radio transmitter firmware; EdgeTX needs to be V2.7.0 or newer.
• Unable to use F1000 packet rate or prompts “Baud rate is too low”:
  • Reason: F1000 requires baud rate higher than 400K; 400K is the default.
  • Solution: set baud rate greater than 400K in Hardware (Model Setup or System menu), restart the radio transmitter, then change packet rate.
• When F1000 is enabled, packet rate between radio transmitter and module is less than 1000:
  • Reason: EdgeTX version.
  • Solution: upgrade EdgeTX to 2.8.0 or above. LiteRadio 3 Pro defaults to EdgeTX 2.8.0 and does not have this issue (as stated).

What’s Included

• 1 * SuperG Nano Transmitter (Black/Red/Grey)
• 2 * 2.4G Glue Stick Antenna
• 1 * USB to Type-C Data Cable
• 1 * Type-C Male to XT30U Male Power Cable
• 1 * GH1.25 Male to FUTABA Male Signal Cable
• 1 * Micro-Nano Module Adapter (Standard Version)
• 1 * Double Side EVA Foam Tape
• 1 * Instruction Manual
• 1 * Service Card

Manuals

• Instruction Manual for the SuperG Nano Transmitter
• Firmware for the SuperG Nano Transmitter
• ExpressLRS Backpack firmware releases
• STL File for the SuperG Nano TX Insulated shell
• Introduction to ELRS Lua Scripts

Details

ExpressLRS 2.4GHz Nano module built for Gemini dual‑frequency diversity and demanding RF environments.

Gemini mode enables dual‑active antennas on dual frequencies for a stronger control link with true diversity receivers.

Clear port labeling makes wiring simple: dual RP‑SMA, USB‑C, buttons, RGB status, and CRSF power/signal pads.

Antenna diversity, true diversity, and Gemini differ in how antennas and frequencies are used to resist interference.

Pairing with a true diversity ELRS receiver helps unlock the strongest link quality benefits of Gemini operation.

Reliable control for FPV racing, long‑range flights, and high‑noise areas.

Dual 1W RF output supports high packet rates while keeping the control link responsive.

Active cooling combines a high‑speed fan with a copper heatsink for sustained higher power operation.

CRSF-based operation works with many radios running EdgeTX/OpenTX when configured via Lua script.

CNC aluminum casing is available in black, red, or gray to match different radio builds.

Package contents include the module and accessories needed for a typical Nano bay installation.

Set the external module protocol to CRSF in the radio model settings.

Select the correct ExpressLRS target before flashing and configuring packet rate and transmit power.

Binding mode can be entered by pressing the button three times.

External DC input can be supplied using an XT30-to-USB adapter cable and a 2–3S battery.

Match the CRSF baud rate and external RF settings to maintain a stable link and avoid telemetry errors.

Use the ExpressLRS device menu to adjust TX power, antenna mode, and binding options.

Everything arrives boxed with antennas, mounting accessories, and quick-start documentation.