New HAM with fading issue

[WSEL330]

Thank you Gang. I am aware that RG58 is not a good choice. That was what was on hand at the time to play here in the shack. I have and am using RG213 and KMR400 for testing and radio play.

[WSEL330]

Update: I contacted Radioddity about the TYT TH-9800. explained my issue. I have had this gear for over a month but they replied that they would replace it. I am not surprised due to the reputation of this particular machine BUT they did act fast with no pushback, as least for now. Thank you again for all of your input to lead me to not keeping a piece of gear that doesn't work. As a newby, I would have kept it and eventually trashed the $ amount paid.