Neewer® TTL 3DRobotics 3DR Radio Telemetry Kit 433MHZ Module For APM APM2
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3DR Telemetry Kit Specifications TTL 3DROBOTICS 3DR Radio Telemetry Kit 433MHZ Module For APM APM2 Very small size Light weight (under 4 grams without antenna) 433-434.79MHz Receiver sensitivity to -121 dBm Transmit power up to 20dBm (100mW) Transparent serial link Air data rates up to 250kbps MAVLink protocol framing and status reporting Frequency hopping spread spectrum (FHSS) Adaptive time division multiplexing (TDM) Support for LBT and AFA Configurable duty cycle Built in error correcting code (can correct up to 25% data bit errors) Demonstrated range of several kilometers with a small omni antenna Can be used with a bi-directional amplifier for even more range Open source firmware AT commands for radio configuration RT commands for remote radio configuration Adaptive flow control when used with APM Based on HM-TRP radio modules, with Si1000 8051 micro-controller and Si4432 radio module Package Contents: TTL 3DROBOTICS 3DR Radio Telemetry Kit 433MHZ Module For APM APM2
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You will need a Y cable if you plan on using these with a Minim OSD on a APM 2.xxx, which of course you will, or you can solder one up yourself. If you are using a 3DR Pixhawk controller the Y cable isn't necessary as it has 2 telemetry ports one for MINIM OSD and one for the Telemetry module. APM 2 and up have only one Telemetry port so you have to Y the Module and the Minim OSD together then into the single Telemetry port.
You should flash these in MIssion Planner with the latest firmware. Easy to do for the Rx module as it plugs right into your USB port but the craft side module has a molex connector and cable. You will need a FTDI 5V programming module and the proper cable to achieve this. I made one from a 1.3 ghz VTX cable and a FDTI plug and used a programing module I got with a MultiWII FC. If you don't have the programming module or cable DO NOT flash the firmware on only the computer side module or they will be useless. The firmware must be identical on both modules or they become paperweights. They do work fine with the firmware that they ship with.
Hope this helps.
These are not actually 3DRobotics radios, they are clones. This doesn't take away anything from them though I would've given 5stars if they were honest about that.
Without a license, in the United States you cannot use the 433mHz version. You will need the 915kHz set.
A complete waste of time and money, so i decided to buy the original 3DR Telemetry 100 bucks, they have case, two port each and are interchangeable plus technical support. I hope this help to somebody.