luciens
Captain
United States
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cootertwo Posted at 5-31 05:39
I LOVE this stuff! I've spent many hours, wondering how this DJI digital stuff is working. I got hooked on the FPV kit (have 2), and started buying Vista and air units, to convert some of my older builds. However, I found a BIG difference between the new FPV drone, and the now, older Vista/Air units. Not near the range, or quality. Sure, much better than my best analog, but not near the same as the FVP drone setup. Is it the Occusync3 ??? So many questions. So many controllers, video units, cameras.... on and on
Well part of it is the much better antenna arrangement on the FPV drone, and part of it is the significantly higher power of the transmitters on both the drone and the controller. The drone's max radiated power is around 1.4 watts, which is double the normal max of 700mw on the DJI air unit and caddix (on 5.8ghz only). Though there's a simple hack to increase the transmitter power output to 1.2 watts.
The remote is also capable of 1.4 watts radiated power on 5.8ghz, where I believe the video transmission takes place at all times with the FPV drone.
Also, simple dipole antennas are used throughout on the FPV drone, from what I can see, on the aircraft and on the remote. The Air Unit and Caddix usually come with LHCP antennas, whereas on the V2 goggles, the stock antennas are dual-band dipoles. So there's a little bit of loss there, due to the different polarization. Not a lot, but there is a little bit. But on the FPV drone, the antennas on the aircraft and on the remote are oriented similarly, so you don't have losses associated with different polarization.
So, the RF situation with the FPV drone is just a much better design, so that's why it has so much more range and reliability than the goggles + Air Unit.
Course, this is all just my observation by looking at the equipment on both. DJI may be doing other things that nobody knows about to make the RF connection on the FPV drone better, so there may be other stuff going on.
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