![]() Both uplink and downlink systems appear to be using MIMO (multi-in-multi-out) diversity antenna systems with an RF output power collectively at ~750 mw for each system.īelow is a list of frequencies the GFSK video downlink system uses corresponding the the DJI "Channel" number. One system for control of the aircraft which operates in the 2.4 Ghz ISM band (exclusively) for control uplink, using spread spectrum and another system that can operate anywhere from 2.28-2.6 Ghz which is a GFSK (Gaussian frequency-shift keying) digital video signal for downlink of the video image. The Phantom 3 Advanced and Professional seem to be using two separate RF link systems. Using a Rhode & Schwarz DDF007 receiver I was able to get a pretty good idea of how the system functions within the RF spectrum. It should be noted that the channels outside the 2.4 Ghz unlicensed ISM band have been locked out by the more recent versions of the application to prevent illegal operation outside the ISM spectrum. I have unlocked the application installed on my mobile device to be able to select all 32 Channels that Lightbridge offers. To help ensure uninterrupted transmission, a high-speed processor chooses the best channel and bandwidth based on current distance and presence of any sources of potential interference.Recently, I have taken a little time to profile the RF systems for the Phantom 3 "Lightbridge" system. The views and controls are completely independent so that the gimbal control will not affect the pilot view or the aircraft’s navigation, and vice versaĪn internal, rechargeable 6,000 mAh LiPo battery lets you fly longer than AA-powered alternatives and simplifies charging Output a picture-in-picture view via mini-HDMI or 3G-SDI to a TV or other external display, where the FPV is layered with the main camera view. Lightbridge 2 can transmit video from two cameras simultaneously: the main camera used to capture video and photographs, and a second camera showing the First Person View (FPV). You can even output video to several devices simultaneously by using a combination of ports Flight information including current status, full telemetry, location, heading, and more is displayed and updated liveĪ combination of 3G-SDI, USB, and mini-HDMI ports enables the controller to be connected to a variety of display devices – TVs, field monitors, FPV goggles, mobile devices, and more. Use the DJI GO app to control your camera, access intelligent navigation settings, and receive a live HD view of what the camera sees, all on your paired mobile device. It has dedicated hardware controls for photo and video capture, gimbal pitch control, Return To Home, as well as customizable buttons ![]() In addition to standard control sticks for piloting, the remote provides direct access to key functions. ![]() To simplify both installation and setup, Lightbridge 2 features just two key components: an air unit and a special transmitter (radio controller) that features the ground unit built in ![]() The controller provides dedicated camera and gimbal controls for convenient operation, while more advanced features can be accessed via the DJI GO mobile app. The controller features mini-HDMI and 3G-SDI video outputs for connecting an HD display and a USB port for connecting a mobile device such as a smartphone or tablet. It breaks into two key components: the first, an air unit that includes connections for select Zenmuse Z15 gimbals as well as connection for an A2 or a WooKong-M flight controller the second, a special transmitter (radio controller) that incorporates the Lightbridge ground unit (a separate module on previous systems). DJI’s Lightbridge 2 is an all-in-one solution that combines video downlink (complete with OSD), aircraft control, gimbal control, and video monitoring in a unified system. ![]()
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