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How to use VTX Control
#1
Some modern VTX has the capability of "Smart Audio" or "VTX Telemetry", which basically allows you to connect the VTX to your flight controller, so you can adjust the VTX settings (power, channel, band, mode) remotely using Betaflight OSD or Taranis LUA script.

Here is a tutorial how to set it up:
https://oscarliang.com/vtx-control/
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#2
I have an issue.... actually 2 or 3. None of my drones work properly with Smart Audio.

On one of my drones I have been running Rush Tank Ultimate and I have tried to set it up with the Smart Audio 1.0, 2.0, and 2.1... none of these work as far as save & exit nor save & reboot. I have tried everything I can think of and find online. When I take the battery off it goes back to the default. I'm not sure what I am doing wrong.

Another drone has Rush Tiny Tank and I have tried all the Smart Audio files and none work. I end up messing with it enough that the Smart Audio menu comes up in my goggles but I cant get it to work at all.

Another drone has an iFlight succex micro stack in it. Well the FC came with a bad Target firmware version so I have since then updated that and now I cant get the iflight succex v.2.1 VTX Smart Audio to work anymore.

If you or someone could give me a bit of advise or a path to start trying to troubleshoot what I am doing wrong, I would greatly appreciate it.

I did read your web post and I will attempt changing my UART and see if that helps...
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