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This radio modem module is the ideal solution for Medium range (>10km) telemetry or communications. RFD900u is the smallest, lightest and most sensitive diversity switched modem on the market. It has Integrated transmit low pass filter to reduce interference to other co-located radio links and uses the latest technology pHemt, high gain (> 24dB), high linearity Low Noise Amplifier (LNA), and is compatible with 3DR / Hope-RF radio modules with license-free use in Australia, Canada, USA, and NZ.


  • RFD900u Radio Modem Module
  • RF : 2 x u.FL/IPX connectors
  • Serial: Logic level TTL (+3.3v nominal, +5v tolerant)
  • Power: +5v, ~300mA max peak (at maximum transmit power)
  • GPIO: 2 General purpose IO (Digital, ADC, PWM capable). 
  • Connector: DF13, 8 way connector (interface cables available)
  • Frequency Range:  902 – 928 MHz (USA) / 915 – 928 MHz (Australia)
  • Output Power: 100mW (+20dBm), controllable in 3dB steps
  • Air Data transfer rates: 4, 8, 16, 19, 24, 32, 48, 64, 96, 128, 192 and 250 kbit/sec ( User selectable, 64k default )
  • UART data transfer rates: 2400, 4800, 9600, 19200, 38400, 57600, 115200 baud  ( User selectable, 57600 default )
  • Receive Sensitivity: <-111dBm at 9.6kpbs, <-107 dBm at 64kbps, <-105dBm at 129kbps (air serial speed)
  • Size: 19.0 mm (wide) x 30.4 mm (long) x 4.5 mm (thick) – Including RF Shield and maximum connector extremeties
  • Weight: 2.7g
  • Mounting: 2 x M1.5 screws
  • Power Supply: +5 V nominal, (+3.5 V min, +5.5 V max), ~190mA avg TX +20dBm, ~230mA peak TX +20dBm, ~77mA RX
  • Temp. Range: -40 to +85 deg C
  • AES128 hardware accelerated encryption (* Software Implementation in progress *)
  • User controllable I/O pins
  • Frequency hopping spread spectrum (FHSS)
  • Transparent serial link
  • Point to Point, or Multipoint networking
  • Configuration by simple AT commands for local radio, RT commands for remote radio
  • User configurable serial data rates and air datarates
  • Error correction routines, Mavlink protocol framing (user selectable)
  • Mavlink radio status reporting (Local RSSI, Remote RSSI, Local Noise, Remote Noise)
  • Automatic antenna diversity switching on a packet basis in realtime
  • Automatic duty cycle throttling based on radio temperature to avoid overheating

Datasheet / User Manual

Weight0.05 kg
Dimensions3 × 2 × 1 cm

RFD900u Modem

A$69.50 ex. GST

Availability: Only 2 left in stock (can be backordered)

Warranty: 1 Year

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