Feature Request: change rf args for FalconGUI

[NerdyProjects]

I am using LimeSDR Mini which has different signal paths in the mixer. By default, the high frequency mixer (LNAH) is selected; for LTE bands below 2 GHz, selecting LNAW improves the signal strength massively.

As far as I can see, rf_args is not implemented in the GUI, so cannot be set.