RFD900x-US Modem Bundle (FCC Approved)

The RFD900x-US Modem Bundle (FCC Approved) is a long-range wireless telemetry solution manufactured by RFDesign. The kit pairs two radio modems to establish a serial data connection between compatible devices, such as a UAV flight controller and a ground-control station. It is designed for applications where reliable telemetry and remote data communication are important.

The RFD900x-US operates in the 902–928MHz US frequency band and supports transmit power up to 1W. Dual RP-SMA antenna connectors and automatic antenna diversity help the radio select a suitable antenna path as signal conditions change. Its SiK-based telemetry firmware supports serial communication and configuration options, depending on the hardware and firmware revision.

Features

• Complete Two-Modem Kit: Includes two RFD900x-US radios for creating a compatible point-to-point telemetry link.

• Long-Range Communication: Designed for extended-range telemetry; achievable distance depends on antenna placement, terrain, line of sight, interference, and ground-station setup.

• Up to 1W Transmit Power: Supports transmission power up to +30dBm on the specified configuration.

• Dual Antenna Connectors: Each modem uses two RP-SMA RF connectors.

• Antenna Diversity: Automatically switches between antenna paths to help maintain the radio link.

• Configurable Data Rates: Supports adjustable air data rates according to the modem revision and firmware.

• Serial Telemetry: Uses a 3.3V TTL UART interface for compatible flight controllers and embedded systems.

• USB Configuration: The included FTDI USB cable supports connection to a computer for setup and testing.

• FCC-Configured Radio Parameters: The US version is supplied with radio settings locked for the specified FCC compliance configuration.

• Multiple Antenna Options: The bundle includes antennas with different form factors for installation flexibility.

Applications

• Long-range UAV telemetry

• Drone-to-ground-station communication

• Compatible Pixhawk flight-controller telemetry

• Remote robotics and autonomous vehicles

• UAV mapping and inspection platforms

• Field data collection and monitoring

• Serial data links for compatible embedded systems

How to Use

1. Check the modem revision: Confirm that both modems are compatible with each other. Some RFD900x revisions are not backward-compatible with older modems.

2. Install the antennas: Attach compatible antennas to the RF connectors before powering on the radios. Avoid transmitting without suitable antennas connected.

3. Connect the air-side modem: Use the appropriate telemetry cable to connect one modem to the UAV flight controller.

4. Connect the ground-side modem: Connect the second modem to a ground-control computer using the supplied FTDI USB cable or a compatible interface.

5. Configure communication: Verify the serial baud rate, air data rate, and other radio settings using compatible configuration software.

6. Check the telemetry link: Confirm that both radios communicate correctly and that the ground station receives valid telemetry data.

7. Test the installation: Verify antenna positioning, signal quality, failsafe behavior, and link stability before operating the UAV.

Important Notes

• FCC approval is not universal authorization. This version is configured for US regulatory requirements. Before using it in Bangladesh or another country, verify local rules for the 902–928MHz band, transmit power, and radio equipment.

• Check hardware compatibility: Confirm the exact RFD900x revision and firmware on both radios. Older modem versions may not be compatible with newer models.

• Use correct voltage and logic levels: The modem uses a 5V nominal supply and 3.3V TTL serial signals. Verify the pinout and voltage requirements before connecting it.

• Range is not guaranteed: Published long-range demonstrations depend on antennas, line of sight, mounting height, radio settings, and environmental conditions.

• Antennas are essential: Connect suitable antennas before transmitting and position them according to the manufacturer's guidance.

• Bundle contents can vary: Some sellers include a 300mm RFD900-to-Pixhawk cable, while other bundles list only the FTDI USB cable and antennas. Confirm the supplied accessories before ordering.

Package Includes

Based on the commonly listed RFD900x-US bundle:

• 2 × RFD900x-US Radio Modems

• 1 × 900MHz quarter-wave monopole antenna, 2.1dBi

• 1 × 900MHz right-angle quarter-wave monopole antenna, 2.1dBi

• 4 × 900MHz half-wave dipole antennas, 3dBi

• 1 × FTDI USB cable

• 1 × RFD900-to-Pixhawk 2.1 cable, 300mm, if included in the selected seller's package