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Phantom 4 RTK is dropping RTK connection - firmware V02.01.0012
1038 16 6-4 13:41
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Jason Heyman
lvl.2
United States
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We just started noticing the RTK is dropping connection midflight and the drone is switching back to GNSS. We are able to manually reconnect midproject, but we end up losing RTK on 20-30 photos. This is a new issue, we have flown this without RTK loss on multiple projects.

We are using internet base station
have verified that the wifi connection is not interrupted (connecting with iPhone hotspot)
have multiple devices using RTK that are not experiencing issues.
Firmware of Phantom 4 RTK Remote Controller V02.01.0012
Firmware of Phantom 4 RTK V02.01.0009

6-4 13:41
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jivago
lvl.4
Flight distance : 23671 ft
Iran
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Hi
Can I ask a question. Why Firmware version of Drone and RC is not the same(V02.01.0012) ?
6-5 07:17
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patiam
First Officer
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United States
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Those are the most current versions availabe from DJI. They appear to have released an RC firmware version that is newer than the newest one for AC.

https://www.dji.com/phantom-4-rtk/info#downloads

6-5 08:16
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jivago
lvl.4
Flight distance : 23671 ft
Iran
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patiam Posted at 6-5 08:16
Those are the most current versions availabe from DJI. They appear to have released an RC firmware version that is newer than the newest one for AC.

https://www.dji.com/phantom-4-rtk/info#downloads

In release log, they said "fixed an issue about language". I wondered that did it worth to download a 650 Mb file for fixing that issue?
6-6 08:57
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ryanthomasak
lvl.1

United States
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I am also having the same issue with our two P4 RTK's. during my flights. I have had this issue before the update. I have to keep my finger ready to pause the mission when rtk drops. Its also like clockwork, every time it does it's the same set amount of time. I am able to reconnect via the rtk tab. I thought maybe it was a wifi setting on my ntrip server but no luck with any settings changes.

Also strange but possibly related. when my controller did the update you listed, the controller locked up and started vibrating and beeping. None of the buttons worked, pulled the battery, discovered the controller has a backup so you can swap batteries without turning it off. Had to wait a considerable amount of time before it lost power.
6-13 07:41
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ryanthomasak
lvl.1

United States
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I am also having the same issue with our two P4 RTK's. during my flights. I have had this issue before the update. I have to keep my finger ready to pause the mission when rtk drops. Its also like clockwork, every time it does it's the same set amount of time. I am able to reconnect via the rtk tab. I thought maybe it was a wifi setting on my ntrip server but no luck with any settings changes.

Also strange but possibly related. when my controller did the update you listed, the controller locked up and started vibrating and beeping. None of the buttons worked, pulled the battery, discovered the controller has a backup so you can swap batteries without turning it off. Had to wait a considerable amount of time before it lost power.
6-13 07:41
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HTA_RP-1
lvl.4

United States
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I recently have had the same problem.  with a very similar almost "timed"  dropping and reconnecting of the CORS station via a hotspot.  Did you find a solution?
7-11 14:00
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Christopher Juliana
New

United States
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I'm having the same problem...did anyone ever receive a resolution?
7-17 08:57
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Jason Heyman
lvl.2
United States
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The only "solution" is to post-process so far for me.
7-18 10:50
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Newbie 75
lvl.1

United States
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I found that when I use an Iphone for a hotspot it times out at 1.5 mins.  It will re-establish connection and regain RTK lock after roughly 30 secs.  I would pause mission during this time but it would drain the batteries in no time.  I then tried a samsung S9 for hotspot and my connection was not interrupted once.  Needless to say my company switched my phone over.  Works great now.   
7-19 09:02
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patiam
First Officer
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United States
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We haven't run into this using a Pixel 2 as the hotspot. Pretty sure we have that firmware.
7-19 09:29
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HTA_RP-1
lvl.4

United States
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patiam Posted at 7-19 09:29
We haven't run into this using a Pixel 2 as the hotspot. Pretty sure we have that firmware.

I was using an iPhone or iPad as hotspot but had not had this dropping of rtk occur previously with the same iPhone.  I will check it again.
7-19 16:41
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Jason Heyman
lvl.2
United States
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We tested this out in the field multiple times now and it appears the iPhone is the root of the connectivity issue. We tested three phones in the field iPhone Xs, iPhone 7 (both running the most recent iOS 12.3.2) and Google Pixel 3 v.10 and both iPhones failed and the Google Pixel worked fine.
7-22 10:26
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patiam
First Officer
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United States
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Good to know, thanks for reporting back!
7-22 13:11
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fansab78a9dd
lvl.1
Flight distance : 3284 ft
United States
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patiam Posted at 7-22 13:11
Good to know, thanks for reporting back!

I concur - we used an android based phone hotspot on multiple missions yesterday and the RTK never dropped once.
7-23 05:50
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djiuser_CHh1MVp5Vl7j
lvl.1

United States
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Newbie 75 Posted at 7-19 09:02
I found that when I use an Iphone for a hotspot it times out at 1.5 mins.  It will re-establish connection and regain RTK lock after roughly 30 secs.  I would pause mission during this time but it would drain the batteries in no time.  I then tried a samsung S9 for hotspot and my connection was not interrupted once.  Needless to say my company switched my phone over.  Works great now.

It doesn't totally surprise me. We write apps for IOS and Android and Apple networking is an absolute pain and has been for years.
7-23 15:35
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TheLensAloft
lvl.1
Flight distance : 95 ft
United States
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Just wanted to say thanks to all who helped find a resolution to this problem. its been a frustrating week of dropped RTK signals and now its all good.
11-5 12:23
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