Why is the remote control of RC model so sluggish with latency with use of APM?

Posted by Pavel on October 4, 2015 at 7:06am

Why is the remote control of RC model so sluggish with latency with use of APM even in manual mode in comparing with remote control without APM, please?

Is it possible to improve it somehow?

Is it better with Pixhawk or is it the same behavior?

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Simon Woywod May 8, 2016 at 4:30am

Did anybody figure out a way to overcome this lag/latency issue?!

I use I Pixhawk and the openlrs modul and the lag is quite bad? I am not sure if I want to fly like this!

Please help me out!
iskess October 11, 2015 at 12:07am

I've seen this using DragonLink PPM out before, but we resolved it. What Rx are you using?
- Dave Schmitt > iskess February 28, 2016 at 2:03pm
  
  How did you resolve this issue with the DragonLink setup?
- Simon Woywod > Dave Schmitt May 8, 2016 at 4:32am
  
  Did anybody figure out a way to overcome this lag/latency issue?!
  
  I use I Pixhawk and the openlrs modul and the lag is quite bad? I am not sure if I want to fly like this!
  
  Please help me out!
- Pavel > iskess October 11, 2015 at 8:38am
  
  I have never tried anything like this to change. I though, that it uses maximum data transfer rate without possibility of user to change anything. Any recommended value to use for frame rate? I used PWM very long time ago with APM 2.5, but I do not remember and can not compare yet, if it was faster. Will try broth options step by step.
- Pavel > iskess October 11, 2015 at 1:09am
  
  I have Open LRS long range RX from hawkeye.
- iskess > Pavel October 11, 2015 at 1:20am
  
  Have you experimented with different PPM frame rates?
  Have you tried using PWM rather PPM? That might help diagnose the problem.
- Pavel > iskess October 11, 2015 at 1:30pm
  
  I have found some similar discussion here: https://github.com/diydrones/ardupilot/issues/1238
- Pavel > iskess October 11, 2015 at 12:09pm
  
  I see option in openLRSng firmware to set "Minimum PPM sync time (us)" there is 3000 value set currently. Not sure what it is exactly and if it is good to change it. I do not see frame rate option to change there.
  
  OpenLRSng Firmware Wiki:
  
  https://github.com/openLRSng/openLRSngWiki/wiki/Settings-Guide
  
  Minimum PPM sync time
  
  The minimum time between PPM frames on the PPM output. The default value works fine for many systems but fickle systems such as Ardupilot require a longer sync time.
  
  openLRSng/openLRSngWiki
  
  openLRSng wiki . Contribute to openLRSng/openLRSngWiki development by creating an account on GitHub.
- iskess > Pavel October 11, 2015 at 1:59pm
  
  I'm sorry, I only have experience with DragonLink LRS and the sync time value is something different than I was talking about.

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