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32 channels went bye bye
1704 8 2015-11-12
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William Burrows
lvl.3
Flight distance : 228698 ft
United States
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Hi,
I just found out that I had 32 channels now the update to the GO app. reduced it to 8 to restrict my signal.
I have not read anything in the forum.
I heard some people are complaining to DJI.
Please comment.
William E. Burrows Jr.
2015-11-12
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busclas
lvl.4
Flight distance : 597277 ft

United States
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These have been gone officially for a while now, you must not have updated in quite some time.
2015-11-15
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terrylewis
Captain
Flight distance : 3517287 ft
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United States
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DJI Lightbridge uses radio channels which are within the ISM bands to transmit video back to the RC. The P3 has antennas in the vertical legs of the landing gear that communicate with the RC on 2.400 GHz - 2.483 GHz. DJI initially implemented 32 channels within this band but later discovered that only 8 channels (13 -> 20) were legally available. The other frequencies are in used by ham radio, satellite comm,  or are used by wireless carriers in various countries. Sploodge offered a hack to enable custom selection of the original 32 channels here: http://forum.dji.com/forum.php?mod=viewthread&tid=27147&fromuid=44480
Use at your own discretion! Those channels outside DJI 13 to 20 may not be legally usable. See this spreadsheet for specific channel usage:
https://docs.google.com/spreadsheets/d/1WuKQD3FvbtFnJ6wkFu9DLxhdxHCSsnZPi90CwTGj3ks/htmlview?pli=1#gid=1477125990

In firmware update 1.410, DJI has added an initial check for radio interference and alerts you to check your settings if it senses high interference within the spectrum. The radio settings and signal graph are located in the GO App under HD Video Link Signal Strength .

Configured for the US, the RC has two setting -> AUTO & CUSTOM (European CE restricts Custom Selection). With AUTO, the RC selects the channel it thinks is best/optimum.  You may also select CUSTOM and select your own channel. Channels with interference have a tall red bar in the graph. Stable channels are green and show no bar at all. In my area in the US, channel 20 has no interference at all, so I select this channel under CUSTOM and get excellent and stable performance.

The 8 channels that are available for our use can also be used by wireless routers and repeaters, so depending on where you live and fly, you can get significant interference. Our RC defaults to automatic channel selection from channels 13 to 20, and can change channels if significant interference is detected before or during flight.

2015-11-15
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Mike-the-cat
Captain
Flight distance : 14411854 ft
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terrylewis Posted at 2015-11-16 10:02
DJI Lightbridge uses radio channels which are within the ISM bands to transmit video back to the RC. ...

Great post. This should be aggregated into the 'best tips' series.
2015-11-17
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Baldo81
Second Officer
Flight distance : 2947493 ft
Portugal
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does the 32 channels hack still work with the new iOS DJI GO 2.8.7? I read that is not possible any more...
2016-8-22
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Bilzc10
lvl.4
Flight distance : 351575 ft
United States
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terrylewis Posted at 2015-11-15 22:02
DJI Lightbridge uses radio channels which are within the ISM bands to transmit video back to the RC. ...

How did you get that pretty graph? Even with the 32 channel hack, I've never seen more than 8 channels in the graph, and there were on,y bars, no dots or lines connecting dots.
2016-8-23
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DJI-Ken
DJI team
Flight distance : 1515312 ft
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terrylewis Posted at 2015-11-16 10:02
DJI Lightbridge uses radio channels which are within the ISM bands to transmit video back to the RC. ...

Thanks Terry for the detailed explanation.
2016-8-23
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DJI-Ken
DJI team
Flight distance : 1515312 ft
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Bilzc10 Posted at 2016-8-23 22:26
How did you get that pretty graph? Even with the 32 channel hack, I've never seen more than 8 chan ...

If you only saw 8 channels then the 32 channels was not installed correctly.Yu can search for it but we do not support it and it may be illegal to use in your country.
2016-8-23
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Bilzc10
lvl.4
Flight distance : 351575 ft
United States
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DJI-Ken Posted at 2016-8-23 10:31
If you only saw 8 channels then the 32 channels was not installed correctly.

Hmm, well is it still available? Last time I tried to reinstall it didn't work.
2016-8-23
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