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How to debug "RTT too high for timesync" problems

I was not too sure if this was the right category for the question, please correct if wrong channel.

I am trying to timesync ardupilot running on a pixracer with mavros running on a jetson nx. As of now I always get RTT’s of about ~100ms, which is very surprising. Sometimes the RTT’s are lower, around 50ms and sometimes they are larger, around 500ms. Can electromagnetic interference play a part in this? I have tried running both mavsdk and mavros, and both cannot sync because of too high RTT.

Do anyone have any tips on how/what to debug when RTT too high for timesync appears?

Servers by jDrones