RFDesign RFD900+ Modem
Best long-range telemetry solution for professional drone and robotics integrators.
The RFD900u Modem from RFDesign is a compact, high-performance telemetry module designed for system integrators. It provides robust, long-range wireless data links, capable of exceeding 10km with appropriate antennas. Featuring diversity switching across two u.FL connectors, it ensures reliable connections. The modem supports user-selectable air data rates up to 250 kbit/sec and includes an integrated transmit low-pass filter to minimize interference. Its open-source firmware allows for customization and field upgrades via serial commands, making it ideal for professional and advanced hobbyist applications.
$74.99
Owner Satisfaction
4.5
/ 5
Category Rank
11
/ 184
#11 in Modems
Price vs Category Average
-86%
Below average
Weight
2.7
/ g
Who it's for
- Developers wanting deep customization for specialized flight control systems
- Long-range drone pilots needing reliable telemetry over vast distances
- Operators flying in environments prone to signal interference
Who should skip it
- Hobbyists on a budget seeking entry-level telemetry solutions
- Beginners intimidated by complex radio telemetry parameter settings
- Users flying lightweight drones with limited power and space
Performance breakdown
Signal Range
Long-range capabilities comfortably exceed 10km for demanding professional telemetry needs.
Form Factor
Ultra-lightweight design integrates seamlessly into the most space-constrained drone builds.
Connection Reliability
Automatic antenna diversity switching ensures a stable link in challenging environments.
Firmware Flexibility
Open-source architecture offers deep customization for advanced system integration projects.
Interference Mitigation
Integrated low-pass filter effectively cleans up signals for clearer data transmission.
Data Throughput
Air data rates are sufficient for telemetry, though not intended for streaming.
Key Specs
Weight
2.7g
Dimensions
19.0 mm (W) x 30.4 mm (L) x 4.5 mm (T)
Frequency Range
902 - 928 MHz (USA) / 915 - 928 MHz (Australia)
Output Power
100mW (+20dBm), controllable in 3dB steps
Max Air Data Rate
250 kbit/sec
Receive Sensitivity
< -111dBm at 9.6kbps
Power Supply
+5 V nominal, ~300mA max peak
Operating Temperature Range
-40 to +85 deg C
Features
- Smallest, lightest, and most sensitive diversity modem
- Integrated transmit low pass filter
- High linearity LNA for improved reception
- Supports multipoint networking
- User controllable I/O pins
- Automatic antenna diversity switching
- Open-source firmware for customization
- Error correction and Mavlink support
What customers say
Users consistently highlight the RFD900+ for its outstanding reliability and durable construction. Its long range performance is a standout feature, offering dependable connections for critical telemetry. While setup may need attention, the resulting signal stability is considered top tier. This modem is recognized as a premium, high performance choice, delivering consistent and worry free operation in challenging conditions. Its value is evident in its dependable performance.
Know before you buy
Under optimal conditions with appropriate antennas, the modem is capable of achieving wireless data links exceeding 10km. Actual range will vary based on your antenna setup, line-of-sight, and environmental interference.
Yes, the RFD900u includes built-in support for Mavlink, making it a plug-and-play solution for most drone telemetry applications.
The modem features two u.FL connectors and continuously monitors signal quality. It automatically switches between the two antennas to ensure you maintain the most reliable connection possible, even in challenging RF environments.
Yes, the RFD900u utilizes open-source firmware. This allows advanced users to customize the modem's behavior and perform field upgrades via serial commands to suit specific integration needs.
The modem operates on a nominal +5V power supply. It draws approximately 300mA at its maximum peak, so ensure your power source can handle this load consistently.
The RFD900u is rated for an operating temperature range of -40 to +85 degrees Celsius. This makes it highly durable for professional outdoor applications, though it is not inherently waterproof and should be housed accordingly.
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$75