Limited VTX power to 1W

Hello,
I’m using a 2.5W VTX Rush Tank Solo in my drone. I recently started using the SmartAudio connection. I am able to change the frequency, channel, band parameters and power. Unfortunately, I noticed that Ardupilot limits the power to 1W.
After setting the VTX_POWER parameter to 2.5W, the VTX only reads 1W.

Is the VTX power limit to 1W a software bug or is it supposed to be like that?

No, its because the VTX doesn’t follow the spec. Try setting to 800mW and see if that gives you the full power out.

Nope, 800mW is not read by this VTX. I am able to control 25mW, 500mW and 1000mW. If I enter the value of 2500mW nothing happens.

obraz

I am able to set 2500mW only using the button on the VTX housing.