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Should I return the p3a to Dji for horizon and disconnection issues?

Discussion in 'Pro/Adv Discussion' started by 30secs, Jul 3, 2015.

  1. 30secs

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    I've been reading so much about issues members are having. Some decide to power through, others return their quads.

    I have a constant horizon issue and disconnection issues. I don't know if I should wait for the next updates or begin the (painful) return process with Dji.

    What are your thoughts and what are you doing?
     
  2. GhostMaster

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    Horizon drift fix is a IMU calibration properly done, cold and in perfect level, and compass calibration too.
     
  3. Buckaye

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    try re-linking your controller for the disconnect issues... that worked for a few of us
     
  4. 30secs

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    Done both.. Several times. No resolve.
     
  5. BenDronePilot

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    In my opinion this is more likely a firmware problem rather than a defect with the quad but iI could be wrong. I would sit tight for the next firmware release.
     
  6. GAP308

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    I'm having the same problems. Do I have to calibrate every time? I've performed a re-calibration multiple times and when I change batteries the problem is back. I don't want to sit tight but it looks like we have to. This sucks!! I wanted to fly through fireworks over the new cpl of days.
     
  7. snerd

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    With the various problems introduced with firmware 1.2.6, it did indeed fix the horizon issue for me. I was looking at some video clips before and after today, and it's definitely fixed. However, I guess I can't be sure if it was the firmware or the cold IMU calibration I did, but I "think" the firmware fixed it. That was part of the gimbal "dance" that so many are talking about during the firmware update. Don't use the VPS, so no comment on that. My P3P does drift somewhat more than before at lower altitude, but nothing that's a deal-breaker for me. Just back from another 4 flights today, just been flying my *** off the last few weeks!
     
  8. omarkatwe

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    Yes if u wanna wait for more than 6 months , return it back to DJI :)
     
  9. Bret Lucas

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    Calibrating the Phantom 3 Compass

    Why Calibrate?
    Compass calibration is important to safe, controlled flight. It compensates for changing background magnetic "noise", a.k.a. magnetic inclination and deviation (not to be confused with declination). Inclination and deviation that isn't corrected through compass calibration will cause inconsistencies between GPS and compass that can result in "toilet bowl effect", a swirling motion that can cause the Phantom to fly out of control.

    What is Magnetic Inclination and Deviation?
    Magnetic deviation is a horizontal variation that comes from the Phantom itself and the equipment you have installed on it as well as the magnetic makeup of the area you are flying in (again not to be confused with declination). Sometimes the deviation will be insignificant, but other times it can be big enough to cause you to lose control. Inclination is a vertical magnetic variation that shifts depending on where you are.

    Warning Signs
    The Phantom can detect when the compass is providing extremely poor (implausible) data. This typically occurs if you place it near a strong magnetic field or do not calibrate it properly. It will flash red and yellow lights and will not start the motors when this happens. Unfortunately, it can only detect this in extreme conditions and you can still fly with really bad compass data if you're not careful.

    Another important safeguard is the compass mod value. This is the total magnetic field as measured by the sensor. You can check this with the Phantom Assistant software. According to DJI, it should be above 750 and below 2,250 but ideally it should be between 1,000 and 1,700. Between 1,200 to 1,500 is very good. Check it away from magnetic influences. If it reads very high or very low, check it again in a different location. If it is still off, it could be magnetised and need degaussing or it could be damaged.

    What Does Calibration Actually Do?
    Calibration measures the magnetic fingerprint of the surrounding area. By turning the compass 360 degrees, the Phantom can see where the compass reading doesn't smoothly increase or decrease. It uses this information to build an adaption table so that when the Phantom turns during flight, the reading is smooth and linear.

    When Should I Calibrate?
    You do not need to calibrate before every flight and in some cases you definitely should not calibrate. That doesn't mean you shouldn't ever bother doing it. It only takes one time for it to go very wrong. The most important aspect of compass calibration is making sure the magnetic "noise" around your Phantom is consistent between calibration and during flight.
    DO Calibrate
    If you go to a new location that is a good distance (i.e. >100 miles) from the last place you calibrated the compass.
    If the terrain has changed significantly i.e. going from prairie to mountainous.
    If you change any equipment on your Phantom.
    If you just installed new firmware.
    If you just degaussed your compass (BTW, don't degauss unless you are absolutely positively sure you need to).
    If you have taken all the precautions to make sure there are no localized magnetic fields near you.
    DO NOT Calibrate
    If you're in an urban area surrounded by concrete, buildings, and hidden or overhead power lines / pipes / etc.
    If you're on the beach or on a boat.
    If you're in immediate proximity to metallic objects or anything magnetic.
     
    Jorovi likes this.