Imgage Transmission Issue
386 10 2021-4-18
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djiuser_g6NvgUtBHmov
lvl.1
Flight distance : 789439 ft
Kuwait
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Hello. I took my DJI FPV drone (bought the combo package) for its maiden flight and i realized that at around 300 meters from the controller, the HD signal on OSD turns orange, goes down to 2 bars and I start to get pixellation in the picture. At 350 meters, it gets worse and at around 400 meters, the pixellation is so bad that I can't even make out the picture anymore and the drone comes out of cruise mode. All the while the RC signal on the OSD is full bars and there are no problems with controlling the drone. I made sure of the following during the flight:

- goggle antennas were tightly in place.
- flew the drone in the city but in a wide open area and there was literally nothing but thin air between the drone and the goggles & controller.
- the controller antenna was in proper position.
- all the components (drone, controller, goggles) were using the latest firmware.
- started the flight at 100% battery power (drone, controller and goggles)
- this was the drone's first flight - bought it brand new, so no history of accidents / damage to any of the compnents.

Can someone help? Is there something I am doing wrong or did i end up getting a faulty unit?
2021-4-18
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Duane Degn
Second Officer
Flight distance : 622234 ft
United States
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You want to check the internet for the FCC Hack.
Many areas have the transmission power limited. Apparently it's possible to change this with an app or some other hack.
I believe this is an issue with local laws regulating the amount of power these devices can transmit at the frequencies used by the video transmitter.
2021-4-19
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MoppelMat
lvl.3
Flight distance : 139167 ft
Austria
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Duane Degn Posted at 4-19 08:12
You want to check the internet for the FCC Hack.
Many areas have the transmission power limited. Apparently it's possible to change this with an app or some other hack.
I believe this is an issue with local laws regulating the amount of power these devices can transmit at the frequencies used by the video transmitter.

It really should work better, even in CE mode.
I flew 1300m before I really got bad reception.
At 300m it should be perfect.
You might want to check for Wifi from surrounding houses or so. But if you are not in an residential area, it should work just fine.

@thread creator:
Make sure you are in auto mode on the googles and not on a fixed channel.
2021-4-19
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tomekyo
lvl.4
Flight distance : 3226991 ft
Netherlands
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MoppelMat Posted at 4-19 08:38
It really should work better, even in CE mode.
I flew 1300m before I really got bad reception.
At 300m it should be perfect.

I admire you certainty about CE FW. I have one as well and find the video link very unpredictable on it. It is perfectly flyable but it depends what type of flying yo udo and also very much where you fly. Personally I would not trust 25mW video to go further than 300 meters LOS. Especially if you want to flip and roll and... your quad. Just consider the FCC hack to be safe instead of sorry ...
2021-4-19
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AntDX316
First Officer
Flight distance : 3394731 ft
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United States
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It can happen.  I've had it happen at times even 100m away but cut outs at full bars.   Depends where you are.  Some areas I can go 1000m with full bars and clean feed.
2021-4-19
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Buzzyone
Second Officer
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United Kingdom
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In ‘city’ areas try changing the Transmission parameters from auto to 2.4Ghz and reduce the bit rate. Doing this will give you more range. In Auto the system selects a band before take off then it doesn’t seem to channel hop once flying. Maybe a bug??

Doing this in a CE country gave me almost 2.5km in a test.

I will be doing a test this week as I am not convinced some of these ‘hacks’ actually do anything!
2021-4-19
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Buzzyone
Second Officer
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I carried out a test today, two drones one with an FCC hack, the other without, so running CE limitations.

The same controller & goggles were used and each aircraft was flown along the same route at the same height to the same location.

The flight was over open countryside away from habitation. Both flights lost communication and initiated RTH at 2500m while not 10,000m it shows that the environment has the biggest effect on range.

2021-4-20
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djiuser_g6NvgUtBHmov
lvl.1
Flight distance : 789439 ft
Kuwait
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Buzzyone Posted at 4-20 12:13
I carried out a test today, two drones one with an FCC hack, the other without, so running CE limitations.

The same controller & goggles were used and each aircraft was flown along the same route at the same height to the same location.

So the fcc hack doesn't work then?
2021-4-20
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tomekyo
lvl.4
Flight distance : 3226991 ft
Netherlands
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djiuser_g6NvgUtBHmov Posted at 4-20 12:24
So the fcc hack doesn't work then?

FCC hack most certainly does work. I have measured it with my power meter and have flown it in the real world. On CE FW my video was very clearly glitching at 300 meters in the neighborhood of some trees with LOS and 600 meters clear LOS, while executing some flips. After applying (and testing it with power meter) of the FCC hack I can reliably fly, where previously was not able to. So if somebody says this hack doesn't work - to me it says he did not apply it properly (which can easily happen if you don't have the power meter)...
2021-4-20
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Buzzyone
Second Officer
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djiuser_g6NvgUtBHmov Posted at 4-20 12:24
So the fcc hack doesn't work then?

I'm not saying it doesnt work, but, power is not the answer to everything, I fly in open countryside, with no buildings or large inhabitations, without all this compeating traffic I can fly with good video feed and good control.

The bands that the drone uses are shared with many other devices, if they are fully used more power will help to cut through the weak or noisy signals. The more buildings and people that are around will result in more bandwidth usage.

I have tested two of the available hacks and used two drones flown to the same locations using the same parameters. The output power is higher with the hack enabled, confirmed with an ImmersionRC meter. For me it made very little diffrence no more that 20 or 30 mtrs. Both drones one FCC & one CE lost communications and initiated RTH at the same location.

Setting the CE drone to use 2.4Ghz only and reducing the bitrate, may give as good results as applying a hack. You basically just have to try and see what works for you.
2021-4-22
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CoreyB10
First Officer
Flight distance : 1665023 ft
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United Kingdom
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tomekyo Posted at 4-19 14:03
I admire you certainty about CE FW. I have one as well and find the video link very unpredictable on it. It is perfectly flyable but it depends what type of flying yo udo and also very much where you fly. Personally I would not trust 25mW video to go further than 300 meters LOS. Especially if you want to flip and roll and... your quad. Just consider the FCC hack to be safe instead of sorry ...

1.3km the 2nd day I had her. People just don't think about local interference at all a lot of the time and just bump their gums straight away.
2021-4-22
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