Phantom Menace
lvl.1
United States
Offline
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I sent DJI the following email regarding both gaining a better understanding of how the RC signal and video signal are transmitted, and why I keep getting the No Signal error even while I can see see the signal and control the drone.
This is the email I sent:
I have two issues I would like some guidance and information on.
First, please set me straight where I am wrong. I am trying to get a solid understanding of how the signal is transmitted between the controller and aircraft on a Phantom 3 Professional.
My understanding is that with the Phantom 3 and integrated camera, There is only one single transmission at 2.4 GHz that is an integrated transmission consisting of both the RC control and the Lightbridge technology which sends me back the live video feed.
I am therefore confused when the video signal starts to break up or is lost, and I still have all the bars indicating a strong RC signal. If they are an integrated signal, how can I lose the video while still having a strong RC signal?
If they are two separate signals, aren’t they at different frequencies? (2.4 GHz for RC and 5.8 GHz for Lightbridge)
Or are the two antennas on the controller separate? One for Lightbridge and the other for RC? If that is true, are they both the same frequency (2.4 GHz)? And if that is true, why would they have different ranges? Wouldn’t it make more sense to have them both have the same range? What point is there to be able to fly further than the video feed works?
Please explain the actual transmission process and frequencies and why there is a disparity in the range of the two transmissions.
In a related question, I have been getting “No SIGNAL” warnings while flying once I get out a ways. I’m not sure what that means, since it does not force a RTH, so there must still be a connection. My signal strength for the RC is at full. I sometimes momentarily lose the video feed just before I get this warning, but I recover the video feed and the warning does not go away.
it seems wrong for it to be saying ‘No Signal’ while I can still view the live video stream and control the bird. It has to be a bug in the app or firmware. If I can see the live video feed and control the drone then I do actually have a signal and if it says I don't, then it is a bug.
It also should not be so vague. If it means lightbridge, or the video signal only, it should say VIDEO LINK LOST. If it means the controller is not connected, It should say RC LINK LOST, and the RTH should be activated. The RTH was not automatically activated when I got the "NO SIGNAL" message, so again, there was still a signal.
It seems that the message is an error or at the very least, the message not resolving one the link is re-established is an error and needs to be corrected. I was hoping you could tell me if DJI was aware of this and are working on it.
Could be coincidental, but I never noticed this before upgrading to the latest firmware, v. 1.2.6
Thank you,
Bob Robertson
This was their response:
Dear Robert,
Thank you for contacting DJI Technical Support.
The video signal and control signal are two separate signals, and using same antennas.
Both the video signal and control signal are using 2.4Ghz Frequency, while on different frequency band.
'No Signal' refers to the video signal.
If the control signal lost, it'll show 'RC signal lost' on the APP screen.
For the live video issue, please read the post below for suggestions:
http://forum.dji.com/thread-23241-1-1.html
Thank you for choosing DJI.
Best Regards,
Sophie
This answer did have some useful information in it, but was incomplete as it did not address why the No Signal Error would pop up when I still had signal or if I temporarily lose the video signal and then it comes back, why the NO SIGNAL message does not resolve and go away.
They did refer me to their apology post regarding Firmware, which leads me to believe that the error showing up erroneously, and not resolving is probably linked to problems in the latest firmware.
At least I now know that the error "NO SIGNAL" only refers to video signal loss, and I shouldn't panic. If I don't have eyes on the drone, I can always hit RTH and it will get the signal. If RC signal is lost, the error message would specifically say, "RC SIGNAL LOST".
Personally, I believe instead of saying "NO SIGNAL" it should say VIDEO SIGNAL LOST", but maybe that's just me.
I just hope that these issues are cleared up in the next firmware release.
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