Hi everyone. Newbie here. I'm new to drones and recently bought a used Mavic Pro 2. I'm now studying for my Canadian basic license with the help of an online groundschool I purchased. Here's the question to which I'd appreciate feedback from folks who've been doing this for awhile. In the groundschool section under 'Data Links, Line of Sight, Interference', different forms of interference are discussed. Then they say it's important to understand what my drone will do due to lost link from interference, but they don't elaborate. Has anyone had experience with this that they can relate to help me out to understand what I can expect in this circumstance? Thanx in advance.
Wondering About Procedures for Lost Link in Flight
- Thread starter KLJ5
- Start date
What they are referring to is what DJI call "Failsafe" ... when the connection between the craft & controller is lost (due to any reason) a set of automated actions will start off, for a Mavic 2 Pro they could be either Return to Home, Land or Hover. Which action that will be performed is set in the app by the user ... the default usually is RTH.
If you in the downloadable full user manual read on page 18, they will explain what happens when the failsafe action is set to RTH. Get it here --> https://dl.djicdn.com/downloads/Mavic_2/Mavic+2+Pro+Zoom+User+Manual+V1.4.pdf
Realistically you need to read the failsafe section of the manual to find out what the Mavic 2 Pro will do, with DJI the detailed behaviour seems to vary from model to model. I lost connection with mine and was beginning to fret as it took a long time to 'reappear'. Re reading the manual was quite illuminating, what the drone actually does is quite complicated and explained the delay.
pdf
One thing I think that could do with clarification by forum members and perhaps a general rule rather than model specific is, what happens if JUST the VIDEO signal is lost?
One thing I think that could do with clarification by forum members and perhaps a general rule rather than model specific is, what happens if JUST the VIDEO signal is lost?
Thanx very much for that. I see there are many variables in the drone's Failsafe RTH behavior. Your direction allowed me to clarify what happens in the event of a temporary loss of signal that's recovered within 60 seconds of the discontinuity and what happens in the interim before it's recovered. Now I'm wondering if there's a warning on the controller if data link is lost or recovered after a loss.
Thanx for your response. I've read the failsafe section and am fairly clear on how things unfold with a loss of data link. The question you pose is interesting. Do you believe that a loss of video signal would activate the RTH function?
I am uncertain, which is one reason I posed the question.
From memory the manuals for some of my DJI drones seem to imply that it will. Yet, at times, I have lost video signal, blank screen no video but with, I think, functional telemetry, and the drones have flown through that.
Until now I have not sought clarification.
Usually both the video live view & the control link will be lost pretty simultaneously ... so when your video live view on your mobile device freezes & ... I think, goes back & white, you usually have lost the total connection & you no longer have the opportunity to manually from the controller, trigger RTH. Instead you need to rely on the "Failsafe" action.
In some cases you can lose the video live view only ... but the control link remains. For example if the usb cable to you mobile device get slightly disconnected ... or the app crashes. In cases like this your craft still can be maneuvered & the failsafe action will not be triggered. That the control link still is up should be shown on the LCD screen on the controller ... If the link still is up & running you can push the RTH button on the controller & the craft will come home.
If it's any doubt if you have a total connection loss ... you can turn the controller off during a period of seconds it takes for the failsafe action to kick in (see manual for those seconds). Doing this will ensure that the failsafe action goes off & your craft enters RTH.
Yep, if all settings regarding the failsafe action & RTH heights is properly set taking into account the surroundings you fly in ... & you haven't flown out with a tailwind stronger than what your craft can fight on the way back with a headwind ... & your battery doesn't get depleted. It should come back to you.
Crouching Leopard
Well-Known Member
Yes there is. It will be in the form of a visual warning on the controller, as well as a verbal warning about controller signal lost.
My experience with the M2 pro, mini and FPV is that as long as everything is set to default, the drone will start to return to home, the drone will reconnect at some point during the return (if controller still operating ie no flat controller battery), and it will continue to return to home unless cancelled.
As a side note, thats why it is so important to ensure your RTH altitude is correct for your flying location. ie 50 Metres is too low if you are surrounded by 80 Metre structures.
I usually find that, the video and control signals get lost & resume within a couple of seconds of each other. When that happens I generally come home anyway as I could be entering a high interference area, be flying too low / behind a building, forested area or some other problematic area. The RTH failsafe works very well I but don't allow myself to rely on it for every occasion. If I feel somethings not right with the signal strength, I try and fix it and if its still not right, I come home.
Good luck with your lessons.
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