Description
Product features:
- 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.
- License free use in Australia, Canada, USA, NZ
Note: Not compatible with older modems
Interfaces:
- 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 (Digita capable).
Technical specification:
| Frequency range | 902 – 928 MHz (USA) / 915 – 928 MHz (Australia) |
| Output power | 1 W (+ 30 dBm), controllable in 1dB steps ( +/- 1dB @=20dBm typical ) |
| Air Data transfer rates | 12, 56, 64, 100, 125, 200, 224, 500 i 750 kbit / s (User settable, 64kbit default)* |
| UART data transfer rates | 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 1M bodów (User settable, 57600 default)* |
| Receive sensitivity | >111 dBm at 12kbps, 105 at 64 kbps and 98 at 200 kbps |
| 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 |
| Temperature range | -40 to +85 deg C, tested operational from -73 to +123 deg C. |
| Dimensions | 57 x 30 x 12,8 mm Including RF Shield, Heatsink and connector extremeties |
| Weight | 14,5 g |
*note these values are correct as of version 3.16 SiK firmware
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.
Software manual for RFD900x SiK is available for download.
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
- 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
Compliance
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.
