Кстати, разработчики так и предлагают делать
https://eb104.ru/internet-magazin/us...mplifier-1200w
It has two SWR sensors (Tandem-match) onboard. First is connected between PA output and LPF input to recognize the situation when wrong or no LPF band selected at all. Second is connected between LPF output and antenna to supply the voltage for SWR and output power measurment by any device.