RF Design – RFD 900x-US Modem – Air End (FCC approved)

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RF Design – RFD 900x-US Modem – Air End (FCC approved)

£120.00 (excl. VAT £100.00)

20 in stock (can be backordered)

RFD 900X-US – Radio modem Air End – Modem, Antennas and JST GH Cable

This is the US version that is FCC Certified.

For end use in the US – see details below.

20 in stock (can be backordered)

SKU: RFD-900X-US-Modem-Air-End Categories: , , , Tags: , Brand:

Product Description

Which RF Design Radio?

RF Design radios are now available in a range of options for different regions. You must choose the correct radio for your use.

Country locked radios 

Radios suffix

US – this is the 900 version of the radio designated for the US market and is FCC approved. Customers in the US should be buying this. It can be sold to other markets who are making drones intended for the US

EU – These are 868 EU certified radios and ship with a EU DOC, intended for the UK and EU market

AU – The 900 version for the Australian market, we do not stock these. RF designs is based in Australia, shop local!

IND – Is designed to be compliant in India for use in the 865-867Mhz unlicensed band

The above radios are locked to the region

None locked

The 868X and UX and 900X / UX these are intended for use with licence holders, such as the 868X in the UK and a licence from OfCom, or in countries without restrictions. We may ask you for proof of compliance or the order will be cancelled. For UK and EU customers choose the EU versions of the radios, for overseas please check local regulations.

New models

UX radios are a smaller version of the X radios and compatible as long as you are using the same frequency radio and the same settings. The TXMod features the full size X radio, so it is also compatible with X and UX series of the same settings.

The U and older + versions are not stocked, please use the latest X and UX versions

Additional Air end with antennas and cable.

Radio parameters pre-configured and locked for FCC compliance with CFR15.247

The kit consists of:

1 x RFD900x-US Radio Modems

1 x Antenna, 900MHz Quarter wave monopole 2.1dBi

1 x Antenna, 900MHz Right Angle Quarter wave monopole 2.1dBi

1 x 300mm RFD to 6 pin JST-GH cable for Pixhawk Cube

RFD900x-US New Features:

  • Radio parameters pre-configured and locked for FCC compliance with CFR15.247
  • New Processor, ARM 32 bit core.
  • Air data rate: 250kbit/s.
  • AES Hardware accelerated encryption. *Fully working*
  • RC PPM Passthrough with telemetry at the same time.
  • Fully ESD protected + filtered – Every IO port is protected and filtered.
  • Original SiK point to point firmware implemented.


  • Long range >40km depending on antennas and GCS setup *80km demonstrated by Edge Research labs on a balloon, 57km in India, on Dipoles.
  • 2 x RP-SMA RF connectors, diversity switched.
  • 1 Watt (+30dBm) transmit power.
  • Transmit low pass filter.
  • > 20dB Low noise amplifier, high IP3.
  • RX SAW filter.
  • All I/O ESD protected and filtered.
  • Re implemented SiK, field up-gradable with compatible SiK firmware, easy to configure.
  • Small, light weight.
  • License free use in Canada & USA
  • Note: Not compatible with older modems


  • RF : 2 x RP-SMA connectors
  • Serial: Logic level TTL (+3.3v)
  • Power: +5v, ~800mA max peak (at maximum transmit power)
  • GPIO: 6 General purpose IO (Digital, ADC, PWM capable).


  • Frequency Range:  902 – 928 MHz (USA)
  • Output Power: 1W (+30dBm), controllable in 1dB steps ( +/- 1dB @=20dBm typical )
  • Air Data transfer rates: 12, 56, 64, 100, 125, 200, 224, 500 and 750 kbit/sec (User settable, 64kbit default)*
  • UART data transfer rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 1M baud (User settable, 57600 default)*

*note these values are correct as of version 3.07 SiK firmware

  • Output Power: 1W (+30dBm)
  • Receive Sensitivity: >-114 dBm at low data rates, high data rates >-98dBm
  • Size: 30 mm (wide) x 57 mm (long) x 12.8 mm (thick) – Including RF Shield, Heatsink and connector extremities
  • Weight: 18g
  • Mounting: 3 x M2.5 screws, 3 x header pin solder points
  • Power Supply: +5 V nominal, (+3.5 V min, +5.5 V max), ~800 mA peak at maximum power
  • Temp. Range: -40 to +85 deg C

Software / GCS Support:

Most parameters are configurable via AT commands, Eg. baud rate (air/uart), power levels.

Integrated support for configuring the RFD900 radios is supported by APM Planner.

The default settings are at 57600 baud, N, 8, 1, and 64k air data rate.

The RFD900x-US manual is here: RFD900x Manual

The RFD900x-US SiK software manual is here : RFD900x Peer-to-peer Manual

Software features include:

  • Frequency hopping spread spectrum (FHSS)
  • Transparent serial link
  • Point to Point
  • 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


The RFD900x-US is compliant with the following standards:

  • FCC Part 15.247 (Frequency hopping and digitally modulated intentional radiators) FCC ID: 2ADLE-900X

Additional Information - Postage Dimensions

Weight0.2 kg
Dimensions10 × 8 × 4 cm


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