RFD900A 915MHz Ultra-Long-Range Radio Module – Up to 40km Line-of-Sight

Description

The RFD900A telemetry radio set offers high data rates, allowing for the transmission of various telemetry information such as altitude, GPS coordinates, battery voltage, and sensor data. which provides excellent range capabilities and penetration through obstacles. It is known for its robust performance and stability, making it ideal for long-range drone operations and applications where reliable data transmission is crucial.Features:

• RFD900A is a 32-bit processor that supports higher baud rates and airspeeds
• Wireless data transmission module with small size and excellent performance
• No distinction is made between transmitter and receiver modules. Each module integrates a USB serial port chip, the USB and UART interfaces are automatically switched, and the USB is preferred
• Operating frequency range 902-928MHz, ISM band
• The transmitting circuit adopts a low-noise amplifier greater than 20DB, and a low-pass filtering unit
• The transmit power is adjustable and the maximum transmit power is 1W
• High-sensitivity LNA and SAW circuit in front of the receiving circuit
• The outdoor communication distance can be up to 40km or more in a straight line (depending on the antenna performance and communication speed requirements)
• Over-the-air data rates up to 250Kbps
• Dual antenna interface, support antenna diversity, differentiated antenna configuration
• Support AT command configuration of local radio, RT command configuration of remote radio
• With module temperature monitoring function, automatic duty cycle adjustment according to temperature to avoid module over-temperature
• Working temperature -40℃ to +85℃
• Dimensions: 33 x 53 x 9.5mm/1.3 x 2.1 x 0.4″
• Weight: 23G/0.05LB

 Specifications:

• Performance:
  • Communication speed: 4.8, 16, 19, 24, 32, 48, 64, 96, 128, 192 and 250kbps
  • Indoor distance: 500m-1km
  • Outdoor direct line of sight: 40km or more, depending on antenna performance
  • Transmit power: 0 to 30dBm, adjustable in 1dBm steps
  • Receive sensitivity: >121 at low speed, >TBA at high speed
  • LNA: >20dB

• Characteristics:
  • Serial data interface level: standard 3.3V, up to 5V
  • Configuration methods: AT commands, for APM Planner, custom configuration tools
  • Working frequency band: 902MHz-928MHz
  • Spread Spectrum Technology: FHSS (Frequency Hopping Spread Spectrum)
  • Serial port rate: 2400, 4800, 9600, 19200, 38400, 57600, 115200bps
  • Optional Antennas: Yagi, 1/2 wave dipole, and 1/4 wave monopole antennas
  • Compliance Standards: FCC Part 15.247, AS/NZS 4268:2008

• Cyber Security:
  • Addressing mode: Network ID 0-499
  • Channels: Up to 50 FM channels
  • Topological network support: point-to-point, point-to-multipoint (point-to-multipoint requires firmware version 2.X to be supported)

• Power Supply:
  • Supply Voltage: Rated 5V, 4V Min, and 5.5V Max
  • Transmit Current: ~1A (Max Power Mode)
  • Receive current: ~60mA

• Interfaces:
  • RF : 2 x RP-SMA connectors
  • Serial: logic level TTL (+3.3v)
  • Power: +5v, ~max max peak (at max transmit power)
  • GPIO: 6 general purpose IOs (digital, ADC, PWM capable).

• Software/GCS support:
  • The software solution is an open source development called “SiK”. It has been re-implemented to fit the new processor architecture found in the 32bit ARM processor core. A boot loader and interface is available for further development and field upgrade of modem firmware via serial port.
  • Most parameters can be configured with AT commands, eg. baud rate (air/uart), frequency band, power levels.
  • Integrated support for configuring RFD900 radios is powered by APM Planner.
  • The default settings are 57600 baud, N, 8, 1 and 64k air data rates.

• The software features are mentioned below:
  • Frequency hopping spread spectrum (FHSS)
  • Transparent serial connection
  • Point-to-point or multi-network
  • Configuration with simple AT commands for local radio, RT commands for remote radio
  • User configurable serial data rates and weather data
  • Error correction routines, Mavlink protocol framing (user selectable)
  • Mavlink radio status reporting (local RSSI, remote RSSI, local noise, remote noise)
  • Automatic antenna diversity on a packet basis in real time
  • Automatic duty cycle reduction based on radio temperature to prevent overheating

Package Includes:

• 2 x RDF900A main modules
• 4 x SMA internal pin antennas 5Dbi
• 1 x USB line
• 2 x UART connector line

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