IronLink RX-4X
IronLink RX-4X XrossBand
- Item : IronLink RX-4X XrossBand
- Type: ISM_2.4, ISM 868
- MCU : ESP32 Pico D4
- RF Chip : Semtech LR1121 x 2
- Telemetry RF power : Max 100mw
- Antenna : 65mm 2.4ghz T Antenna x 2
- Frequency Range : 868 MHz and 2.4 GHz
- Working voltage : DC 5V
- Minimum receiver refresh rate: 50Hz
- Maximum Refresh Rate : 500Hz / F1000Hz
- Protocol : Default Protocol
- Weight : 2.75g (without antenna) / 4.35g (with antenna)
- Dimension : 28 x 28 x 4.7 mm
- Firmware Version : ExpressLRS v3.6.0 pre-installed
- FW Target : Edith IronLink RX-4X XrossBand
About IronLink RX-4X XrossBand
The Ironlink RX-4X is a next-generation ExpressLRS Gemini Receiver designed to deliver outstanding link reliability, ultra-low latency, and uncompromising RF performance.
Featuring an advanced dual-band, dual-channel architecture, the RX-4X simultaneously receives both 2.4GHz and 900MHz ExpressLRS signals, providing exceptional resistance to interference and significantly improving link redundancy.
By processing multiple data streams in parallel, the receiver minimizes packet loss and maintains a stable control link even in demanding RF environments.
Whether you're flying FPV, long-range, or professional UAV missions, the Ironlink RX-4X offers the confidence to push further with reliable communication every flight.
Key Features
- ExpressLRS Gemini Xrossband Dual-Band Receiver
- Simultaneous 2.4GHz & 868/900MHz RF Operation
- GemX Crossband Communication Support
- Up to 2 × 100mW Independent Telemetry RF Output
- Four High-Performance External Antennas
- Advanced RF Redundancy for Superior Link Reliability
- Optimized for High Packet Rates and Ultra-Low Latency
- 20 × 20 mm Mounting Compatibility
- Designed for Challenging RF Environments
- Compatible with the Latest ExpressLRS Gemini Features
- 1. Advanced Packet Rate Performance
- Sub-GHz 250Hz (Sensitivity: -111dBm): Unlock faster control response with the new 250Hz Sub-GHz mode, delivering lower latency while maintaining outstanding receiver sensitivity. Designed for pilots who require rapid link updates, this mode offers smooth, responsive control without sacrificing long-range reliability.
- Sub-GHz 200Hz Full (Sensitivity: -111dBm): The enhanced 200Hz Full mode provides significantly higher update rates than conventional SX1276-based 900MHz systems. With improved data throughput and stronger resistance to RF interference, it delivers a more reliable control link and stable telemetry for demanding FPV and UAV missions.
- Dual Band X150Hz (Sensitivity: -112dBm): Powered by ExpressLRS Gemini Technology, Dual Band X150Hz simultaneously utilizes 2.4GHz and Sub-GHz frequencies to maximize signal reliability. By combining both RF links, it greatly improves interference immunity while maintaining fast 150Hz packet updates for confident control in challenging environments.
- Dual Band X100Hz Full (Sensitivity: -112dBm): For applications requiring full channel resolution, Dual Band X100Hz Full delivers synchronized 2.4GHz and Sub-GHz communication with complete 16-channel support. This mode offers excellent link stability, robust telemetry, and dependable performance when flying in complex RF conditions.
- 2. Next-Generation K Modes
- DK500 (Available with ExpressLRS v3.5): Developed for competitive pilots and high-performance UAV applications, DK500 introduces a next-generation FSK modulation scheme with integrated Forward Error Correction (FEC). Intelligent packet redundancy helps recover lost data before it affects control, providing outstanding reliability during high-speed flights and crowded racing environments. When paired with a Gemini-compatible transmitter and receiver, DK500 delivers one of the most resilient RC links available.
- K1000 Full Sub-GHz (Available with ExpressLRS v3.5): Breaking new ground in long-range radio performance, K1000 Full Sub-GHz delivers an incredible 1000Hz update rate over 868/900MHz frequencies. Despite its extremely high transmission speed, it maintains exceptional stability and responsiveness, making it ideal for pilots seeking maximum control precision with ultra-fast telemetry and command updates.