The FlySpark FLS-RX Remote Range Extender Series is a professional-grade, high-power radio link solution built to dramatically increase UAV/FPV remote-control range for long-distance missions. Available in 3 output classes — 1.4W, 5W and 25W — the FLS-RX family pairs industry-leading hardware with FHSS full-frequency-hopping and optimized verification algorithms to deliver ultra-stable control at extreme distances.

Measured performance in open-air tests:

• 1.4W → ~60 km

• 5W → ~120 km

• 25W → 250 km+

Each unit is factory-tested (power instrument + field “saw” range test) and supplied with a matched high-power directional antenna option for maximum line-of-sight performance. The system integrates seamlessly with popular OSD/autopilot setups (Arkbird OSD compatibility for channel mapping), and supports advanced channel mapping where original channel inputs can be remapped to extended output channels for mission flexibility.

Designed for professional UAV surveillance, long-range inspection, mapping, and public-safety deployments, FLS-RX is engineered for long continuous operation — robust thermal management, metal housing, and strict QA on every unit make it suitable for demanding field use.

Key features

• Ultra-long range: up to 250 km+ (25W with high-gain antenna, open air).

• Three power classes: 1.4W / 5W / 25W to match mission and local regulatory needs.

• FHSS full frequency hopping + verification algorithm for robust link performance beyond traditional spread-spectrum systems.

• Factory instrument + live range (saw) tested for each unit — strict QA.

• High-power metal housing with active cooling for long continuous operation.

• Compatible with Arkbird OSD channel mapping (original channel1-4 can auto-become channel7-10 outputs).

• Works with professional high-gain directional antennas (sold separately) for maximum line-of-sight distance.

• Easy DC power supply integration and simple installation.

Technical specifications (summary)

*Measured ranges are line-of-sight, open-field tests. Real world range depends on antenna, mounting height, terrain, local RF noise, and local regulations.

Operation notes & quick setup

1. Mount the transmitter antenna as high / clear as possible for best LOS performance.

2. Use matched high-gain directional antennas on ground station and UAV to maximize range.

3. Set transmitter and receiver to the same FHSS channel set; follow the lock procedure to avoid accidental re-tuning.

4. Check local RF regulations for allowed transmit power and bands before operation — use the model that complies with local law.

5. For Arkbird OSD systems: when connected, the original channel1–4 inputs can be configured to output as channel7–10 automatically — useful for advanced mixing/control.

6. Keep cooling clear of obstruction for long continuous runs.

Safety & compliance (must read)

• Professional equipment: Intended for trained operators. Follow local laws and aviation/telecommunications regulations regarding transmit power and frequency usage.

• Regulatory: Before using 5W or 25W units, verify legality in your country. High-power transmitters may require licenses or be restricted. FlySpark is not responsible for fines or legal issues resulting from non-compliant use.

• Installation safety: Secure antennas and hardware; avoid contact with RF radiating elements when transmitting at high power.

• Environmental: Weather, obstructions, and RF interference will reduce practical range.

• QA disclaimer: Measured ranges above are test results under ideal conditions; operational range may vary.