Can you also send a screen shot that shows the audio input level? I can easily get to 20W on FT8 with the input level around 0db - your power supply is sagging a bit at 14.6V so that could also be a small contributing factor

It is FT8 screen, but I use TUNE mode for this screenshot.

The issue is same with MeanWell PS where is 15V constantly.

Hello.

try DIGU with FT8

73 Klaus DL1DTL

It is not about FT8, it is global problem - on FM, in TUNE mode, IN USB (FT8) everywhere

Good morning to all.
In my case the same thing happens. Maximum power 14.7 W. Work on FT8 and Remote with 15 V continuous.
What can happen?

I know that, I am a little bit annoying, but guys any idea how to fix it?

Thank you
Jan OK1NP