<p>
The Radio telemetry system base on 3DR Radio system and 100% compatible.</p>
<p>
It's designed as an open source Xbee replacement radio set, offering a lower price, longer range (approx one mile) and superior performance to Xbee radios. It’s available in 915Mhz and 433Mhz; and in the following configurations:&nbsp; serial board (for the air) and USB (for the ground).</p>
<p>
The system provides a full-duplex link&nbsp; using HopeRF's HM-TRP modules running custom, open source firmware.&nbsp; Interface to the module is via standard 5V-tolerant TTL serial / FTDI USB serial.</p>
<p>
Firmware upgrades and configuration are fully supported in the APM Mission Planner. Configuration is also possible through the 3DR Radio configurator and AT commands.</p>
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&nbsp;</p>
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<span style="font-size:14px;"><strong>◆Features</strong></span></p>
<p>
•Small size and light weight</p>
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•915MHz</p>
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•Receiver sensitivity to -121 dBm</p>
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•Transmit power up to 20dBm (100mW)</p>
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•Transparent serial link</p>
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•Air data rates up to 250kbps</p>
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•MAVLink protocol framing and status reporting</p>
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•Frequency hopping spread spectrum (FHSS)</p>
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•Adaptive time division multiplexing (TDM)</p>
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•Support for LBT and AFA</p>
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•Configurable duty cycle</p>
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•Built in error correcting code (can correct up to 25% data bit errors)</p>
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•Demonstrated range of several kilometers with a small omni antenna</p>
<p>
•Can be used with a bi-directional amplifier for even more range</p>
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•Open source firmware</p>
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•AT commands for radio configuration</p>
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•RT commands for remote radio configuration</p>
<p style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px;">
<span style="font-size:12px;"><font face="Arial">•Adaptive flow control when used with APM<br>
•Based on the HopeRF HM-TRP radio module, featuring an SiLabs Si1000 RF microcontroller.</font></span></p>
<p style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px;">
<span style="font-size:12px;"><font face="Arial">Datasheets of HM-TRP module: http://www.hoperf.com/upload/rf_app/HM-TRP.pdf<br>
Documentation: http://code.google.com/p/ardupilot-mega/wiki/3DRadio<br>
Radio Configurator(Air module need a USB-UART tool like FTDI to configure): http://vps.oborne.me/3drradioconfig.zip</font></span></p>