RFD 868x Modem

Product Details



Product Code: RFD868x

Sales price £105.00
Sales price without tax £87.50
Tax amount £17.50



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 and Multipoint SiK firmware, field upgradeable, easy to configure.

Small, light weight.

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: 868-869 MHz

Output Power: 1W (+30dBm), controllable in 1dB steps ( +/- 1dB @=20dBm typical )

Air Data transfer rates: 4, 8, 16, 19, 24, 32, 48, 64, 96, 128, 192 and 250, 500 kbit/sec ( User selectable, 64k default )

UART data transfer rates: 9600, 19200, 38400, 57600, 115200, 400k, 921k baud ( User selectable, 57600 default )

Output Power: 1W (+30dBm)

Receive Sensitivity: >121 dBm at low data rates, high data rates (TBA)

Size: 30 mm (wide) x 57 mm (long) x 12.8 mm (thick) - Including RF Shield,

Heatsink and connector extremeties

Weight: 14.5g

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, tested operational from -73 to +123 deg C.

Software / GCS Support: The software solution is an open source development called "SiK".

It has been re implemented to suit the new processor architecture available on the 32bit ARM processor core.

A boot loader and interface is available for further development and field upgrade of the modem firmware via the serial port.

Most parameters are configurable via AT commands, Eg. baud rate (air/uart), frequency band, 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 RFD868/900x manual is here: RFD900x Manual

The RFD868/900x SiK software manual is here : RFD900x Peer-to-peer Manual.


Software features include:

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

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