aburkefl
Second Officer
Flight distance : 78612 ft
United States
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I'm not an expert - if we're lucky, someone who knows more than I will come along.
The Phantom 3 is using Lightbirdge to provide the video feed back to you. It is NOT using WiFi. WiFi has a much, much more limited range and capability. According to comments from DJI employees, here's another major difference.
In most "add-on" FPV systems, the craft is controlled by freqs in the 2.4 GHz range (and is digital) and the video is in the 5.8 GHz range, but is analog. The signal controlling the craft is much less prone to interference. With the Lightbridge system, DJI says this signal is digital and is much less susceptible to interference than the typical FPV analog system.
The RTH (Return to Home) function on your craft is initiated either by the user (i.e., pressing the button on the remote controller) OR in the event the controlling signal is lost - NOT the video signal!
If your Phantom is still in your line-of-sight and you lose the video signal, you should still be able to manually control and fly your craft back to your position. If the controlling signal (NOT the video) is lost between your controller and your craft, it will automatically initiate an RTH and attempt to return to what it thinks is the Home Point.
A DJI employee put it the other day - "...once you take off and are flying, if you lose the video signal, you can still fly." You're sort of "flying blind" but the controlling signal is still there, you still have control of your craft - you even have control of the video and still capability, you can change the elevation of the camera (the tilt of the gimbal) and shoot video and take pictures, etc. You just can't see what's happening until after you download the media from your SD card.
I tend to keep my Phantom very close. I think the greatest distance my Phantom has been from me (while in the air!) has been about 200 - 300 yards. At that distance, I'm already at the point where I can no longer identify the orientation of my Phantom. If I shield the glare from my mobile device and see the picture well enough, I can tell where my Phantom is pointing - that is more than enough for me to identify that I'm capturing what I want to capture with the camera.
otherwise, for the most point, when I glance down at my screen, I'm looking at the battery level (the battery in my Phantom) and making sure I'm not dangerously close to running out of power. When mine gets to 50% I really keep a close eye on it. Now that the "voice" has been brought back in the Pilot app, I'm sure eventually I'll hear the "....low battery...." warning. Having my Phantom only 200 - 300 yards away should give me plenty of time to head back before hearing the dreaded "...critical battery warning..." and having it start an RTH on its own.
I like having control and making sure it's doing what *I* want it to do.
I'll bet the following scenario has already happened a lot more than owners are willing to admit:
You've done everything on your checklist.
Motors are started and you lift off.
You fly around/over/under/by this huge tree/building/tower and - suddenly - you realize you can't actually see your Phantom. You think "...I'll be able to see it again in a few seconds..."
In just a few more seconds, the Phantom will recognize it has lost the controlling signal (the connection between the controller and the Phantom has been broken) and it will initiate the RTH ON ITS OWN! and then you start asking yourself "....oh s**t. Do I have the RTH failsafe height set high enough to clear that tree/building...?"
In a panic, maybe even before you actually see your beloved Phantom, you grab one of the sticks or push the RTH button, whatever - you have just now negated the RTH function - reversed it. The Phantom now thinks that YOU have regained control - at least it thinks there's a control link still there and you've taken it over.
How many situations like this result in another visit here and "....my Phantom just flew away...."
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