BrotherHobby C3 ExpressLRS Receiver 915MHz/2.4GHz Dual Band 100mW Nano RX, ESP32-C3 LR1121 TCXO
BrotherHobby C3 ExpressLRS Receiver 915MHz/2.4GHz Dual Band 100mW Nano RX, ESP32-C3 LR1121 TCXO
BrotherHobby
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Overview
The BrotherHobby C3 900/2400 Dual Band 100mW Nano RX is an ExpressLRS Receiver designed for 915MHz / 2.4GHz operation in a compact 13mm*20mm, 1g (receiver only) format. The receiver uses an ESP32-C3+LR1121+TCXO chipset and provides IPEX1 antenna connection and 5V input power.
Key Features
- Dual-band ExpressLRS receiver: 2.4GHz / 915MHz
- TX Power: 100mW
- Chipset: ESP32-C3+LR1121+TCXO (LR1121 RF chip design; ESP32-C3 main control)
- Built-in temperature compensated crystal oscillator (TCXO)
- IPEX1 antenna connector; supports a 915M+2.4G dual band antenna
- Pad labels: GND, 5V, TX, RX
- RGB indicator light
- Board marking: “915MHz/2.4GHz Dual Band Nano RX V1.0”
Specifications
| Model | BrotherHobby C3 900/2400 Dual Band 100mW Nano RX |
| Name | ExpressLRS Receiver |
| RF Freq | 2.4GHz / 915MHz |
| TX Power | 100mw |
| Input Power | 5V |
| Connector | IPEX1 |
| Weight | 1g(receiver only) |
| Size | 13mm*20mm |
| Chip | ESP32-C3+LR1121+TCXO |
ExpressLRS Dual-band Mode Compatibility (Chart)
Modulation modes shown
- FLRC
- LoRa
- FSK
Frequency band notes shown
- 2.4G frequency band: 2400 - 2480 MHz
- Low band: 433, 866, 868, 915 MHz
- GemX dual-band: 2.4G + low frequency band
- Remark: “Din” in the name indicates CVCA mode
- Remark: The ones with “Full” in the name indicate full resolution mode
Ranger (2.4G frequency band, SX128x) rates shown
- FLRC: F1000 Hz, F500 Hz, D500 Hz, D250 Hz
- LoRa: 500 Hz, Full 333 Hz, 250 Hz, 150 Hz, Full 100 Hz, 50Hz
Nomad (Dual Band, LR1121) rates shown
- LoRa: 200 Hz, Full 100 Hz, 100 Hz, 50 Hz, 500 Hz, Full 333 Hz, 250 Hz, 150 Hz, Full 100 Hz, 50 Hz, X150 Hz, Full X100 Hz, 250 Hz, Full 200 Hz
- FSK: DK 500 Hz, Full K1000 Hz
- Note shown: Available with ELRS v3.4
Bandit (Low Band, SX127x) rates shown
- LoRa: 200 Hz, Full 100 Hz, 100 Hz, 50 Hz, 25 Hz, D50 Hz
Wiring & Betaflight Setup (Example)
- Connect receiver pads to the flight controller: GND to GND, 5V to 5V, TX to FC RX, RX to FC TX.
- In Betaflight Configurator “Ports”: enable the corresponding UART (example shown: UART2) as Serial Rx (Configuration/MSP shown at 115200).
- In “Configuration”: set Receiver Mode to “Serial Digital Receiver”, and set Serial Receiver Provider (Serial ReceiverProvider) to “CRSF”.
Binding
- The receiver enters the frequency matching state by being powered on three times in a row.
- Note: Once the receiver is bound, it will remember the information and will automatically connect successfully after restarting without the need to re-bind.
- Turn off the remote control.
- Repeatedly power on the receiver three times; the receiver light flashes twice, indicating frequency matching mode.
- Turn on the remote control, enter the LUA operation interface of ExpressLRS, and select the [BIND] button to confirm.
- The receiver indicator light stays constantly on, indicating successful frequency matching.
LED Indicator Meanings
| Rainbow color gradient | Power on self test |
| Green and orange lights flash alternately | Enter WiFi upgrade mode |
| Red light flashing fast | No RF chip detected |
| Orange dual flash | Crossover Mode |
| Orange triple flash | Connected, but does not match the settings in model match |
| Orange slow flash | Waiting for connection |
| Always on | Connected |
What’s Included
- BrotherHobby C3 900/2400 Dual Band 100mW Nano RX
- User manual
- 4*30awg connection line*1
- T-Shape Dual Band Antenna*1
- Transparent Heat Shrinkable Tubing*2
For compatibility questions or setup support, contact support@rcdrone.top or visit https://rcdrone.top/.
Details
BrotherHobby C3 dual-band nano receiver uses solder pads labeled RX, TX, 5V, and GND for straightforward wiring.
BrotherHobby C3 ExpressLRS Receiver uses a Semtech LR1121 RF chip and supports sub-GHz and 2.4GHz LoRa with up to 100mW telemetry power.
The ExpressLRS dual-band mode compatibility chart lists supported packet rates across Ranger, Nomad, and Bandit module options.
BrotherHobby C3 ExpressLRS Nano RX uses an ESP32-C3 main control chip and provides clearly labeled GND, 5V, TX, and RX pads for wiring.
A built-in temperature compensated crystal oscillator (TCXO) helps maintain stable frequency performance across hot and cold conditions.
The 915MHz/2.4GHz dual-band antenna design supports switching bands without swapping antennas.
BrotherHobby C3 ExpressLRS receiver uses an ESP32-C3 with LR1121+TCXO, supports 915MHz/2.4GHz, and provides 5V power and IPEX1 antenna connection.
BrotherHobby C3 ExpressLRS receiver setup uses GND and 5V power plus FC TX/RX wiring, with UART Serial RX enabled and CRSF selected in Betaflight.
BrotherHobby C3 ExpressLRS receiver binding uses a three-power-cycle method, with LED patterns indicating bind and connection status.
BrotherHobby C3 dual-band nano receiver includes the RX board, T-shape dual-band antenna, 30AWG connection cable, user manual, and heat-shrink tubing.
