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ELRS-R24-S RC Receiver
Brand: Matek
Product Code: ELRS-R24-S
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ELRS-R24-S RC Receiver
Description
1. Product Summary
1.1. Product Description
The ELRS-R24-D is a 2.4 GHz ExpressLRS receiver developed by Matek Systems. Equipped with an ESP8285 microcontroller and SX1280/1281 RF chip, it delivers high-performance, long-range, and ultra-low-latency communication. Featuring true diversity with dual external IPEX antennas, this receiver provides stable and reliable signal reception for FPV drones, fixed-wing aircraft, and UAV systems.
1.2. Product Features
- 2.4 GHz ISM band (2400–2480 MHz).
- ESP8285 + SX1280/1281 chipset with PA/LNA SE2431L.
- Dual-antenna diversity (2× IPEX MHF1 connectors).
- Telemetry output power up to 23 dBm.
- CRSF serial protocol for ExpressLRS transmitters.
- Compact PCB size 21 × 15 mm; weight ~3 g with antennas.
- Input voltage range 4–9 V DC.
- Supports UART and WiFi firmware updates.
- Firmware target: MATEK_2400_RX (enable USE_DIVERSITY).
1.3. Applications
- FPV drones: High-performance, long-range radio link.
- Fixed-wing aircraft: Reliable and interference-resistant control.
- UAV systems: Integration for professional telemetry and flight control.
- Robotics: Real-time wireless communication systems.
2. Product Selection
2.1. Model Comparison
Table 2-1. Comparison of Matek ELRS-R24 Series Receivers
| Model | Antenna Type | Diversity | Telemetry Power | PA/LNA | Size (mm) | Weight |
|---|---|---|---|---|---|---|
| ELRS-R24-S | Built-in Ceramic | No | 20 dBm | AT2401C | 21 × 15 | 1.2 g |
| ELRS-R24-D | Dual IPEX MHF1 | Yes | 22.5–23 dBm | SE2431L | 21 × 15 | 3 g |
NOTE: When flashing firmware for R24-D, ensure “USE_DIVERSITY” is enabled in the ExpressLRS Configurator.
3. Specifications
Table 3-1. ELRS-R24-D Technical Specifications
| Frequency Range | 2400–2480 MHz (ISM Band) |
| MCU | ESP8285 |
| RF Chip | SX1280 / SX1281 |
| Protocol | CRSF (ExpressLRS) |
| Input Voltage | 4–9 V DC |
| Telemetry Power | Up to 23 dBm |
| Power Consumption | 70 mA typical, 90 mA in WiFi mode |
| Interface | UART (TX, RX, GND, 5V) |
| Antenna Connectors | 2× IPEX MHF1 (diversity) |
| Size | 21 mm × 15 mm |
| Weight | ~3 g (with antennas) |
| Firmware Target | MATEK_2400_RX (USE_DIVERSITY = ON) |
4. Hardware and Pinout
4.1. Connector Pin Definition
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | 5V | Power | Power input 4–9 V DC |
| 2 | GND | Ground | Ground connection |
| 3 | TX | Output | Telemetry output / CRSF TX |
| 4 | RX | Input | CRSF RX |
| 5 | BOOT | Input | Firmware flashing mode |
5. Firmware and Binding
5.1. Firmware Configuration
- Flash firmware via ExpressLRS Configurator.
- Target: MATEK_2400_RX.
- Enable “USE_DIVERSITY” for this model.
- Update supported via UART or WiFi (built-in ESP8285).
5.2. Binding Procedure
- Power the receiver on and off three times to enter Bind mode (LED double flash).
- On the transmitter, select “Bind” in ExpressLRS menu.
- When connection is successful, LED becomes solid.
6. Environmental and Mechanical
| Operating Temperature | -20 °C ~ +85 °C |
| Storage Temperature | -40 °C ~ +90 °C |
| Shock Resistance | 25 g / 11 ms / 3 axes |
7. Notes
- Ensure antennas are properly installed and not blocked by carbon or metal structures.
- For best signal, keep both antennas at 90° orientation from each other.
- Use a clean, stable 5 V power supply to avoid signal interference.
- Do not flash R24-D with non-diversity firmware (R24-S version).
- Firmware and documentation available on the official ExpressLRS GitHub.
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