How To Do FPV With The Phantom 2 Part 4

Posted by
March 28, 2015
FPV & Racing


DJI has an anti-interference board that should fix this issue, “but it doesn’t” which is why I don’t care if you even try installing it in the first place. By using this method of re-grounding the video signal, those lines in your video should completely disappear!

This is a relatively simple mod, but it does require you to do some soldering. I highly recommend that you look at the earlier tutorial where I show how to install the video transmitter on the Phantom 2. There’s a bunch of good soldering info in that article that I don’t cover on this page.

Before we start this modification, let me tell you why this interference is here in the first place. If you have no background in electronics, this may be hard to follow, but I’ll try to explain it in the best way I can.

As you know, the gimbal that the GoPro is mounted to has three motors. Each motor works in the same way that a normal brushless motor works, with one exception. Unlike a normal motor where the three magnetic polls pulse in series, a brushless gimbal motor uses two polls at once to pull the motor in opposite directions. It’s kind of like a game of tug-of-war. At any point in time, the two magnetic polls are fighting each other to keep the motor in a specific position. To do this, the motors have to operate at very high frequencies to keep the motor exactly where it needs to be. This makes the gimbal very accurate, but because of the modulations in power, the ground circuit becomes extremely noisy (inconsistent) when the motors are running.

Since all of the electronics onboard are connected to the same battery, they all have the same common ground (their all connected in some way), so it’s not surprising that this noisy power signal gets into the video transmitter and causes interference.


Back to business

Remember that black wire that came with your video transmitter? We’re going to be using that to make a more direct and less noisy ground connection from the transmitter to the GoPro.

The First step is to take the black wire and insert it into the video transmitter plug “making sure that its on the right side of the yellow video wire”.

Then, plug it into the video transmitter and confirm that the black wire is connected to the pin that’s labeled GND (which means ground).

If you originally had to take the video transmitter off of the Phantom 2 to get to the wires, now you can put it back on using a new piece of double-sided mounting-tape. Just makes sure that while you’re doing this, the gimbal is still isolated from the wires and is able to move freely.

Taking a look at the USB plug that comes with the gimbal, you can see that there’s a little blob of solder on the base of the connector. The entire outer casing of this connector is actually grounded, so that’s what we’re going to use to solder our wire to.

Now that you know what to do, put some solder on both the end of the wire and the connector, then solder the wire to the left side of the USB plug. Doing this will make the wire stick “up” from the gimbal which is what we want, since the video transmitter is mounted higher than the gimbal.

Once the solder has cooled off, connect the USB plug back up to the gimbal,while being very careful not to destroy the ribbon cable.

The final step is to rotate the gimbal around with your hands to see if it has any trouble moving. As long as the cable isn’t getting caught on anything, the gimbal should have no problem with the new wire being there.

Now that everything is done, you should be able to turn on the Phantom 2 and all those horrible lines in the video should be gone!

If you’re wondering where this method for removing video interference came from, I’m not the one who figured it out. I found out how to do this on a forum somewhere, but I did simplify how it’s wired compared to how I originally saw it being done.

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