Sudden Loss of Workable Fix in Open

Mark Wheeler

Active Member
Has there been any new revelation about the East Coast mid afternoon issue with fixing? Using an LS as Base and an LS+ as rover I had a couple hours in the afternoon where it floated in a wide open field. Great PDOP, but 4 super engines would not fix. After the first half hour I switched over to the state RTN (4 constellations) and was able to get through the afternoon. Every fifteen minutes I would change the setup back to check LS Base, but unsuccessful for fixing. All morning I had no issues, even in the woods.
 

Adam

Well-Known Member
5PLS
Has there been any new revelation about the East Coast mid afternoon issue with fixing? Using an LS as Base and an LS+ as rover I had a couple hours in the afternoon where it floated in a wide open field. Great PDOP, but 4 super engines would not fix. After the first half hour I switched over to the state RTN (4 constellations) and was able to get through the afternoon. Every fifteen minutes I would change the setup back to check LS Base, but unsuccessful for fixing. All morning I had no issues, even in the woods.
Mark, give me a call when it happens again.
 

Nate The Surveyor

Well-Known Member
This afternoon doldrums issue, bothers me. I bought the t3, and LS + for this very reason. Now I hear it is still there.
Is it not possible to go to a field, and press some sort of button, and it runs through all the satellites, and FINDS the bad birds? And blocks them, from use, so that until next time you run this utility "find and block bad satellites", they simply are excluded?
I may not know what all is going on inside a gnss reciever, but that works in my mind..... Would it work in real life?
N
 

Mark Wheeler

Active Member
I appreciate the independence of the 4 engines, but in these times we need a help button that puts all the best and good satellytes in one engine so that we can finish the day or don't look like a statue to the client. The increase in sat coverage is significant. With the advancements in coverage and technology we should be able to squeeze something out of the doldrum times. I was able to at least keep moving when I switched to the state RTN.
 

Shawn Billings

Shawn Billings
5PLS
I can say that the RTK lead engineer is looking into it. At some times of the day Glonass or Galileo will not fix. The reason is unclear, but he has been able to reproduce the issue which is a good start to resolving it. Until then, the only resolution I have found is to disable Glonass or Galileo on the Triumph-LS. Typically the situation only lasts for an hour or two, so every few minutes I turn the constellation back on to see if the situation has passed. I have gone for days without seeing the issue at all.

Nate, to answer your question about the LS Plus running two engines, the answer is no. It does not use the same GNSS firmware that the standard Triumph-LS. The 4 engines are hard-coded in the LS Plus, each engine tied to its own processor.
 

Ben Purvis

New Member
Turning off Galileo seems to address the problem. Advanced settings GNSS, signals and tracking.
Hello Shawn, I can't seem to be able to find this setting. I've searched the users guide and fumbled through everything I could think on on the LS to find the "signals and tracking"with no luck......do you mind providing a slightly more detailed instruction list on how to turn a constellation off? I'm having similar problems in open spaces at the same times discussed.
 

Adam

Well-Known Member
5PLS
Hello Shawn, I can't seem to be able to find this setting. I've searched the users guide and fumbled through everything I could think on on the LS to find the "signals and tracking"with no luck......do you mind providing a slightly more detailed instruction list on how to turn a constellation off? I'm having similar problems in open spaces at the same times discussed.
Hey Ben, I wanted to follow up here after our call. Tap the hardware settings button twice, then tap gnss, signals, then tap galileo. It will gray out when it is disabled.

You can also access the advanced settings from the settings (gear) icon on the left of the action screen.

Glad to see you digging into the forum.
 

Michael Green

New Member
I can say that the RTK lead engineer is looking into it. At some times of the day Glonass or Galileo will not fix. The reason is unclear, but he has been able to reproduce the issue which is a good start to resolving it. Until then, the only resolution I have found is to disable Glonass or Galileo on the Triumph-LS. Typically the situation only lasts for an hour or two, so every few minutes I turn the constellation back on to see if the situation has passed. I have gone for days without seeing the issue at all.

Nate, to answer your question about the LS Plus running two engines, the answer is no. It does not use the same GNSS firmware that the standard Triumph-LS. The 4 engines are hard-coded in the LS Plus, each engine tied to its own processor.
Since the firmware is different in the LS & LS+ Would that make a difference in which one would work better as a rover on the North Carolina RTN? Seems like the LS worked better on the network, as a rover, prior to the last update.
 

Mark Wheeler

Active Member
I am running an LS+ as Rover, LS (no Bed 3 signal) as Base. During an afternoon doldrum the LS+ Rover w/ LS base often fixes poorly, at times waiting 10 or 15 minutes before giving up. I have then switched the LS+ rover to the state RTN (4 constellation) and been able to function much better. At times the constrast is extreme. Could the extra Bed 3 signal make that much difference. Next week I will give a try with the old T2 (basic GPS, Glonass, limited Gal & Bed) to see how that works.

I tried switching off the Glonass and Galileo constellations as Shawn recommended. Sometimes that helped, other times it did not help. Either way that elimates significant variability. Also, the LS+ would sometimes lock up when making the constellation switches.

Has development made any headway for improving fixes during these times of the day?
 

Matthew D. Sibole

Well-Known Member
5PLS
I had issues this morning using my T3 over TCP. I stopped the base and cleared NVRam and it went back to normal.

I know that isn’t easy for everyone using UHF but I was able to do this being 3000’ from my base over tcp.
 

Mark Wheeler

Active Member
Matt,
How do I clear the NVRam on the LS base? I am using mifi communications. Or even "how do I clear NVRam directly from the LS base"? There is not much on the LS Base screen.
 

giulio

Member
I also tried 13 satellites open sky between gps and glonass fixed and after permanent float. I tried to deactivate glonass on 2 of 4 motors and those two deactivated fixed, also deactivated the third motor and this too fixed, the only float the one with glonass
20210914_123142.jpg
 

Mark Wheeler

Active Member
If using an LS+ as Rover and an LS as a base, do the Glonass and Galileo have to be turned off on both or just the rover to get by this issue?
 

Adam

Well-Known Member
5PLS
Start with the rover. If it doesn't fix the issue reboot and restart the base.
 
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