The design TXMOD is an all in one long-range telemetry data and RC control system. Designed to work in conjunction with any Radio Controller capable of accepting JR Transmitter Modules, the RFD TX Module can transmit the PPM stream from the controller to the vehicle via the RFD900X long-range telemetry modem while also receiving telemetry data received from the aircraft. The module's built-in WiFi link allows for a simple webpage based configuration and broadcasting of telemetry data to a computer or smart device. It is a JR style module that plugs into any RC transmitter that has can accept JR style modules (Frsky Taranis, JR, Frsky Horus) It provides a bridge between the RC transmitter and aircraft while carrying RC PPM data and mavlink telemetry streams at the same time.
Long-range using RFD900x telemetry modem
2.4GHz WiFi AP / Client modes with TCP + UDP packet support
Easy configuration by web-based wizard built-in
Direct plug into any RC transmitter with JR style modules (eg. Taranis X9D, Horus, ...)
Wide range 5-18V input supply
Optimized for use with Mavlink/Mission Planner/QGCS
Dimensions: 52.05 x 66.94 x 38mm
RFD900x New Features:
New Processor, ARM 32 bit core.
Air data rate: 500kbit/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.
Asynchronous multipoint firmware, *Beta release*
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.
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 / 915 - 928 MHz
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: >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
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.
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.
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 duty cycle throttling based on radio temperature to avoid overheating
The RFD900 is designed to be compliant with the following standards:
FCC Part 15.247 (Frequency hopping and digitally modulated intentional radiators)
AS/NZS 4268:2012 (Radio equipment and systems - short range devices)
The modem is designed for system integrators who will integrate the modem into their own projects and product prototypes. The user is responsible for compliance with local regulations for radio transmitters.
Long-range remote control (RC) via PPM
Ground control station (GCS) telemetry gateway over WiFi
1 x RFD900 TXMOD
1 x RFD900x Radio Modem
1 x Antenna, 868-900MHz Quarter wave monopole 2.1dBi
1 x Antenna, 868-900MHz Right Angle Quarter wave monopole 2.1dBi
4 x Antennas, 868-900MHz Half wave dipole 3dBi
RFD 900 TXMOD Datasheet
RFD900X Modem Datasheet
RFD900x Peer-to-peer User Manual